AutoCodes – GMC – P207F GMC

P207F GMC Code - Reductant Quality Performance

Quick Answer

The aftertreatment system is equipped with two Nox Sensors and modules. Common causes include Degraded, Diluted or Incorrect Diesel Exhaust Fluid, Exhaust System leak, Diesel Exhaust Fluid Deposit in Def Injector Decomp Tube. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P207F GMC indicates Reductant Quality Performance.
Common causes: Common causes include Degraded, Diluted or Incorrect Diesel Exhaust Fluid, Exhaust System leak, Diesel Exhaust Fluid Deposit in Def Injector Decomp Tube.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 4,191

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 01, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P207F GMC Description

The aftertreatment system is equipped with two Nox Sensors and modules. The upstream NOx Sensor 1/1 is located on the Turbocharger elbow downpipe and is permanently connected to a corresponding Nox Sensor Module mounted to the hot side of the engine block. The downstream NOx Sensor 1/2 is located at the outlet of the SCR Catalyst and is permanently connected to a corresponding Nox Sensor Module which is mounted on the right frame rail. The NOx Sensors and NOx Sensor Modules are calibrated to each other and must be replaced as an assembly. The two NOx Sensor and Module assemblies are not interchangeable. The NOx Sensor Modules are smart devices and communicate with the Powertrain Control Module (PCM) over the J1939 Data Link. The NOx Sensor Modules perform their own internal diagnostics and report malfunctions back to the PCM. The NOx Sensors are used to monitor the efficiency of the SCR Catalyst and dosing system. The PCM will illuminate the Malfunction Indicator Lamp (MIL) after the diagnostic runs and fails in two consecutive drive cycles. The PCM will turn off the MIL immediately after the monitor runs and passes.

OBDII Code P207F GMC - Reductant Quality Performance - AutoCodes.com — P207F GMC Code - Reductant Quality Performance

What does this mean?

What are the Possible Causes of the DTC P207F GMC?

Degraded, Diluted or Incorrect Diesel Exhaust Fluid
Exhaust System leak
Diesel Exhaust Fluid Deposit in Def Injector Decomp Tube
Defective SCR Catalyst

How to Fix the DTC P207F GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

There is a Factory Service Bulletin for the following GMC models:
2010 GMC Savana
2011 GMC Savana
2011 GMC Sierra
GMC Factory Service Bulletin OBDII Code P207F

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P207F GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need more information on how to fix the P207F GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P207F GMC Code

1. What are the common symptoms of OBDII code P207F GMC (Reductant Quality Performance)?

- Common symptoms include the illumination of the Check Engine Light (CEL) on the dashboard, reduced engine power, and potential emission system warnings.

2. What are the possible causes of OBDII code P207F GMC?

- Possible causes include a faulty reductant quality sensor, issues with the diesel exhaust fluid (DEF) system, wiring problems, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose OBDII code P207F GMC?

- Diagnosis typically involves using an OBDII scanner to retrieve the trouble codes and conducting a thorough inspection of the DEF system, reductant quality sensor, and related wiring for any signs of damage or malfunction.

4. Can a low DEF fluid level trigger OBDII code P207F GMC?

- Yes, a low DEF fluid level can trigger this code as it affects the reductant quality performance. It is recommended to check and refill the DEF tank to the appropriate level if low.

5. How can I repair OBDII code P207F GMC?

- Repair options may include replacing the faulty reductant quality sensor, repairing or replacing damaged wiring, refilling the DEF tank, or reprogramming the PCM if necessary.

6. Is it safe to continue driving with OBDII code P207F GMC illuminated?

- It is generally not recommended to ignore the CEL and continue driving with this code active, as it can lead to reduced engine performance and potential emissions issues. It is best to address the problem promptly.

7. Can a DIY enthusiast fix OBDII code P207F GMC at home?

- Depending on the underlying cause, DIY enthusiasts with the necessary tools and knowledge may be able to address this code by replacing components like the reductant quality sensor or checking and refilling the DEF fluid.

8. How often does OBDII code P207F GMC occur in GMC vehicles?

- The occurrence of this code can vary depending on the specific model and age of the GMC vehicle, as well as maintenance practices related to the DEF system.

9. Will clearing the OBDII code P207F GMC turn off the Check Engine Light?

- Clearing the code may temporarily turn off the Check Engine Light, but if the underlying issue is not addressed, the light is likely to come back on as the system detects the problem again.

10. Are there any recalls related to OBDII code P207F GMC in GMC vehicles?

- It is advisable to check with GMC or the National Highway Traffic Safety Administration (NHTSA) for any recalls related to OBDII code P207F or issues with the reductant quality system in specific GMC models.