AutoCodes – GMC – P208D GMC

P208D GMC Code - Reductant Pump Control Circuit High Voltage

Quick Answer

The selective catalytic reduction system reduces Oxides of Nitrogen (NOx) emissions by injecting a metered amount of reductant into the exhaust gas stream entering the selective catalytic reduction catalyst. Common causes include Faulty Reductant Pump and Sensor Assembly, Reductant Pump and Sensor Assembly harness is open or shorted, Reductant Pump and Sensor Assembly circuit poor electrical connection. 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: P208D GMC indicates Reductant Pump Control Circuit High Voltage.
Common causes: Common causes include Faulty Reductant Pump and Sensor Assembly, Reductant Pump and Sensor Assembly harness is open or shorted, Reductant Pump and Sensor Assembly circuit poor electrical connection.
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 416

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 26, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P208D GMC Description

The selective catalytic reduction system reduces Oxides of Nitrogen (NOx) emissions by injecting a metered amount of reductant into the exhaust gas stream entering the selective catalytic reduction catalyst. Within the selective catalytic reduction catalyst, the reductant reacts with the NOx to form nitrogen, carbon dioxide, and water vapor. Upstream and downstream NOx sensors provide the Engine Control Module (ECM) and the Reductant Control Module via serial data. The Reductant Control Module varies the amount of reductant added by varying the reductant injector duty cycle in response to changes in engine-out NOx levels. The Reductant Control Module supplies system voltage to the reductant pump motor. The Reductant Control Module controls the solenoid by grounding the control circuit. The Reductant Control Module can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage. The Diagnostic Trouble Code (DTC) will be set when the Reductant Control Module detects a short to voltage in the control circuit.

OBDII Code P208D GMC - Reductant Pump Control Circuit High Voltage - AutoCodes.com — P208D GMC Code - Reductant Pump Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P208D GMC?

Faulty Reductant Pump and Sensor Assembly
Reductant Pump and Sensor Assembly harness is open or shorted
Reductant Pump and Sensor Assembly circuit poor electrical connection
Faulty Reductant Control Module

How to Fix the DTC P208D 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P208D 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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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 P208D GMC Code

1. What are the common symptoms of OBDII code P208D GMC (Reductant Pump Control Circuit High Voltage)?

The common symptoms of code P208D include the Check Engine Light being illuminated, reduced engine performance, and potential failures of the reductant pump system.

2. What can cause OBDII code P208D GMC to trigger?

Code P208D is typically triggered by issues such as a faulty reductant pump, damaged wiring or connectors in the reductant pump circuit, or a malfunctioning reductant pump control module.

3. How serious is OBDII code P208D GMC?

While code P208D may not cause immediate harm to your vehicle, it can potentially lead to increased emissions and reduced fuel efficiency if left unresolved. It is recommended to address the issue promptly.

4. Can I continue driving with OBDII code P208D GMC active?

It is generally safe to drive with code P208D present, but it is advisable to have the issue diagnosed and repaired as soon as possible to prevent further complications.

5. How do I diagnose OBDII code P208D GMC?

Diagnosing code P208D involves using a diagnostic scanner to retrieve the code, inspecting the reductant pump and its components for any visible damage, and testing the electrical connections in the circuit.

6. What are some repair tips for OBDII code P208D GMC?

Repair tips for code P208D may include replacing the faulty reductant pump, repairing or replacing damaged wiring, ensuring proper connections, and resetting the code after repairs are completed.

7. Can I repair OBDII code P208D GMC myself?

While some DIY enthusiasts may attempt to address code P208D themselves, it is recommended to seek professional help, especially if you are not experienced with diagnosing and repairing automotive electrical systems.

8. How much does it cost to fix OBDII code P208D GMC?

The cost of fixing code P208D can vary depending on the root cause of the issue, the extent of the repairs needed, and labor rates in your area. It is advisable to obtain quotes from reputable mechanics or dealerships.

9. Will resetting the OBDII system clear code P208D GMC?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing code P208D is not addressed, the code is likely to reappear once the vehicle is driven and the system performs its diagnostic checks.

10. How can I prevent OBDII code P208D GMC from coming back?

To prevent code P208D from recurring, it is essential to address the root cause of the issue, perform regular maintenance on the reductant pump system, and address any related issues promptly to ensure optimal vehicle performance.