Technical Service Bulletins

TSB / Campaign Number – LI49.20-P-053142 On some 2015 Mercedes BLUETEC GL350’s the instrument cluster displays the message of low AdBlue (DEF) level although the fill level of the AdBlue tank is sufficient. The following fault codes may be stored in the engine control unit: DTC fault codes 16D000, 16D100,16CC00, 16CD00, 16CE00, 16CF00 the fill level of the AdBlue® tank is too low. Instrument Cluster might display “16 starts remaining”. This fault code usually occurs normally if the AdBlue (DEF) level is under about 1.5 gallons (5 liters). Due to software issue, the system calculates erroneous result. Corrective action would be to perform the available software update.

TSB #LI14.40-N-071290 Check engine light illuminates in instrument cluster, fault codes P203B31 or P203B49 or P206B31 present in AdBlue(R) (SCR) control unit

Some Mercedes-Benz Sprinters with a 3.0L Diesel engine may exhibit an indicator lamp illuminating on the instrument cluster, with the following fault codes P203B31 or P203B49 or P206B31 present in the (SCR)control unit. The corrective action is a software update.

TSB/Campaign Number – 25-001-15 REV. A

Some Dodge Ram’s equipped with a 6.7L Diesel engine may have a manufacturing defect in the DEF level sensor. It may have occurred if the DEF level sensor was built within the time frame listed above. There may be a Malfunction Indicator Lamp (MIL) illuminated. Upon further investigation a technician may find one or more of the following Diagnostic Trouble Codes (DTCs). P203B – Reductant Level Sensor Circuit Performance, P203C – (Diesel Exhaust Fluid) Reductant Level Sensor Circuit Low, P203D – (Diesel Exhaust Fluid) Reductant Level Sensor Circuit High. Corrective action would be to replace the Defective DEF Level Sensor.

TSB #18-034-21 P203E and P203F Additional Diagnostic Information

Some RAM 2500 and 3500 Pickups and Ram 3500, 4500 and 5500 Cab Chassis models have been setting the following DTCs:  P203E and/or P203F. This bulletin provides additional information regarding diagnosing Diesel Exhaust Fluid (DEF) issue in extreme cold weather, DTC codes P203E Reductant Level Sensor1 Circuit Intermittent and/ or P203F Reductant too low set. The following issues have been identified.

• DEF Tank Overfilled.
• Residual Ice in the DEF Tank or Covering the Level Sensor.
• DEF Crystallization Covering the Level Sensor.

Corrective action is to follow the repairs provided in the TSB.

TSB #18-015-21 REV. A Powertrain Control Module Updates

Ram 3500, 4500, 5500 Cab Chassis

Some vehicles equipped with a 6.7L Cummins Turbo Diesel Engine may have a Malfunction Indicator Lamp (MIL) appear.  Upon further investigation, the following DEF pump DTCs may appear:

• P20E8-00 Reductant pressure too low
• P1C54-00 SCR NOx Catalyst missing

Corrective action is to reflash the ECM /PCM with the latest software.

TSB #18-012-21 REV. B Powertrain Control Module Updates

Ram 2500, 3500 Pickup

Some vehicles equipped with a 6.7L Cummins Turbo Diesel Engine or HO Turbo Diesel Engine may have a Malfunction Indicator Lamp (MIL) appear.  Upon further investigation, the following DTCs may appear:

• P20E8-00 Reductant pressure too low
• P1C54-00 SCR NOx Catalyst missing
• P20EE-00 NOx Catalyst System Efficiency Below Threshold
• P208B-00 Reductant pump 1 Control performance

Corrective action is to reflash the ECM /PCM with the latest software.

TSB #18-093-22 This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/ PCM) with the latest available software

MODELS:

• 2021    (DJ)      RAM 2500 Pickup 6.7L
• 2021    (D2)     RAM 3500 Pickup 6.7L

SYMPTOM/CONDITION:

Some customers may experience a Malfunction Indicator Lamp (MIL) illumination. The technician may find that one or more of the following codes have been set:

• P20EE - SCR NOx Catalyst Efficiency Below Threshold - Bank

Correction: Reprogram the PCM/ECM with the latest software

TSB/Campaign Number – LTB01249NAS2 – Land Rover Discovery (LR) On some 2017 Land Rovers a “DEF (Diesel Exhaust Fluid) Dosing Malfunction” and/or “No Engine Restarts Message in XXX Miles” message may be displayed on the Instrument Cluster (IC). Upon further diagnosis, the technician may find DTC (Diagnostic Trouble Code) P208A-13 and P208C-11 stored in the Powertrain Control Module (PCM). Cause: PCM software error. Solution: Computer software update.

TSB/Campaign Number – LTB01084NAS1– Land Rover Discovery (LR) On some Land Rover Discovery and Range Rover Sport models with a V6-3.0L DSL Turbo engine, a Malfunction Indicator Lamp (MIL) may be illuminated with “No Engine Restarts in XXX miles, or Incorrect Diesel Exhaust Fluid Quality Detected” warning message displayed on the Instrument Cluster. During diagnosis, the technician may find Diagnostic Trouble Code (DTC) P2BA9-00 and/or P2BA9-92, which may be accompanied by DTCs P2BAE and P2BAF, stored in the Powertrain Control Module (PCM). Cause: Sensitivity of the PCM software related to the Selective Catalyst Reduction (SCR) control, or Incorrect Diesel Exhaust Fluid (DEF), or an air leak in the engine intake system. Solution: Take to the Dealer.  

TSB/Campaign Number N241NAS2– On some Land Rover and Range Rovers a potential issue has been identified on certain vehicles within the listed Affected Vehicle Range where a “Diesel Exhaust Fluid Malfunction” warning message is displayed in the message center or the MIL (Malfunction Indicator Lamp) may be illuminated on the Instrument Panel Cluster (IPC). Action: Affected vehicles already in the hands of customers should be updated at the next available opportunity.

Discovery (LR)                         2017-2019       VIN 000001-093227

Discovery (LR)                         2019                 VIN 400488-402827

Range Rover Sport (LW)          2017-2019       VIN 100436-838935

Range Rover (LG)                    2017-2019        VIN 297609-539983

TSB/Campaign Number PIP5510C: DTC P20EE – Diagnostic Procedure for SCR System (Nov 3, 2017)

All Chevrolet Silverado & GMC Sierra 2017-2018 6.6L Condition: The Malfunction Indicator Lamp (Check Engine Light) is coming on. Corrective action would be to perform a complete diagnostic for any trouble code or symptom found.  Then perform the ECM software update referred to in campaign 17337.

TSB/Campaign Number 16-NA-377 – Service Emission System Message with DTC P206B Set/Stored – (Sep 6, 2017)

Chevrolet Colorado 2017-2018, 2.8L

Chevrolet Cruze 2017-2018, Gen II 1.6L

Chevrolet Equinox 2018, 1.6L

Chevrolet Express 2017-2018, 2.8L

Chevrolet Silverado 2017-2018, 6.6 L

GMC Canyon 2017-2018, 2.8L

GMC Terrain 2018, 1.6L

GMC Savana 2017-2018, 2.8L

GMC Sierra 2017-2018, 6.6L

After recently filling the DEF tank with automatic dispensing nozzles, and the ignition in the on position, a technician may find DTC P206B set or stored in the history. It has been found that some DEF fill equipment uses pumps that create a high level of temporary aeration of the DEF fluid being dispensed in the tank. Corrective action would be to reduce the likelihood of this issue occurring, the vehicle should be keyed off during filling of the DEF tank.

TSB/Campaign Number PIP5614 – Check Engine Light on with DTCs P0046, P113B and / or P206B. – (Dec 10, 2018) Chevrolet Silverado 2018 6.6L L5P and GMC Sierra 2018 6.6L L5P Condition:  The Service Engine Soon (SES) light is on. Technicians may find one of the following DTCs

P0046 – Turbocharger Boost Control Position Performance

P113B – Exhaust Gas Temperature Sensor 1 Not Plausible

P206B – Reductant Quality Sensor Circuit Performance

This may be due to a software anomaly. Corrective action would be to update the ECM for the codes listed above.

TSB/Campaign Number 17-NA-219 – Diagnostic Tip for Malfunction Indicator Lamp (MIL) Illuminated, Auto Stop Inoperative – DTC U029D, U029E, P249D, P249E Set – (Aug 31, 2017)

Chevrolet Colorado 2016- 2018, 2.8L

Chevrolet Express 2017-2018, 2.8L

Chevrolet Silverado 2017-2018, 6.6L

GMC Canyon 2016 2018, 2.8L

GMC Savana 2017 2018, 2.8L

GMC Sierra 2017 2018, 6.6L

Concern: The MIL is illuminated. The technician may find one or more of the following DTCs set: U029D, U029E, P249D, P249E. This has been found to be caused by moisture intrusion past a damaged or missing seal located in the connector for the NOx sensor wiring harness. If diagnostics lead to NOx sensor replacement, corrective action would be to inspect the mating chassis electrical connector for corrosion and clean or replace as necessary.

TSB #N192266751 Incorrect Driver Display Message for Diesel Exhaust Fluid

On certain Chevrolet Silverado HD and GMC Sierra HD models with a 6.6L Direct Injection V8 Turbo Duramax Diesel Engine, the following conditions may exist:

• The instrument panel cluster may incorrectly display the message “DEF Low” when a diesel engine fluid (DEF) controller internal fault is detected (DTC P20FF), instead of displaying the proper “Service DEF System” message.
• The customer may complain of excessive engine fan noise at a low vehicle speed.
• Under certain conditions, the diagnostic system may set one of the following DTC’s when there is no problem with a component: (P20EE, P226D, P16F3 and P129F).

The corrective action is to reprogram the engine control module.

TSB #202300791 Diesel Exhaust Fluid System Inactive

The corrective action is to reprogram the reductant control module.

TSB #21-NA-125: Service Emission System and/or Service Engine Soon Lamp Illuminated On Driver Information Center (DIC), DTC P208B Set

The corrective action may be remedied by reprograming the reductant control module.

TSB #21-NA-007: New Calibration for Emissions Reductant Fluid Module, Service Emission System and/or Service Exhaust Fluid System Message Displayed on Drivers Information Center (DIC), Malfunction Indicator Lamp (MIL) Illuminated - DTC P206B Set

TSB #22-NA-069: Malfunction Indicator Lamp (MIL) Illuminated - DTC P11D5 and/or P20EE Set 

Subject: On some new GMC Sierra and Chevrolet Silverado 3500 4WD V8-6.6L DSL Turbo vehicles with under 10,000 miles (16,000 km), unusual NOx sensor learn values have been observed. This may be the result of being driven in changing altitude and/or humidity.

Remedy: Take the vehicle to the dealer to have the Reductant Control computer reprogrammed.

TSB #PIE0695 Service Engine Soon (SES) Lamp Illuminated, Service Emission System and/or DEF Level Low Message On Driver Information Center (DIC), DEF Level Sensor Reading Incorrectly, DEF Level Sensor Being Erratic, DEF Level Sensor Stuck and/or High DEF Consumption

Some GMC Sierra and Chevrolet Silverado 4WD trucks with a V8-6.6L DSL Turbo engine may display a Service Engine Soon Lamp Illuminated, Service Emission System and/or DEF Level Low Message, DEF Level Sensor Reading Incorrectly, DEF Level Sensor Being Erratic, DEF Level Sensor Stuck and/or High DEF Consumption.

Correction: If you encounter a vehicle with the above concern, contact your General Motors dealership.

TSB# 20-NA-110 Diesel Exhaust Fluid (DEF) Pump Unable to Build Pressure After Replacement

Some Escalade ESV 4WD L6-3.0L DSL Turbo owners may experience that after replacing the DEF pump, the pump will not build pressure and one or more of the following DTCs may set:

• P20E8: Reductant Low Pressure

• P249C: Excessive Time to Enter Closed Loop Reductant Injection Control

If this condition occurs, please have your vehicle towed to the dealership for repair.

TSB #20-NA-110 Diagnostic Tip to Diagnose Emission Reduction Fluid Tank Heater Element Exposed to Diesel Exhaust Fluid (DEF) Fluid, Service Emission System/Service Exhaust Fluid System Displayed on the Driver Information Center (DIC), Malfunction Indicator Lamp (MIL) Illuminated - DTC P20BB and/or P20C3 Set

On the 2021 and 2022 Escalade some technicians may comment that after replacing the DEF pump, the pump will not build pressure and one or more of the following DTCs may set:

• P20E8: Reductant Low Pressure
• P249C: Excessive Time to Enter Closed Loop Reductant Injection Control

If low pressure is present, this may be because the DEF pump filter has dried out. Corrective action: Allow the vehicle to sit overnight with the new pump and DEF fluid to re-saturate the DEF pump filter. In the morning, perform the leak test three additional times. The pump should now be able to build pressure.

TSB #21-NA-002 Information on Diesel Exhaust Fluid (DEF) Pump Unable to Build Pressure After Replacement

Some customers may comment that the MIL is illuminated with or without a "Service Emission System/Service Exhaust Fluid System" message. Some technicians may one or more of the following DTCs set in the Engine Control Module (ECM):

• P20BB: Reductant Heater 1 Control Circuit Low Voltage
• P20C3: Reductant Heater 3 Control Circuit Low Voltage Test Status

This condition may be caused by a faulty Emission Reduction Fluid Tank heater. Corrective action is to diagnose and possibly replace the Emission Reduction Fluid Tank heater.

TSB #18-030-21 Powertrain Control Module Updates

Some vehicles equipped with a 3.0L V6 Turbo Diesel Engine built before 2/17/21 may have a Malfunction Indicator Lamp (MIL) appear.  Upon further investigation, a DEF pump DTC may appear, P20FB-00.

Corrective action is to reflash the PCM with the latest software.