AutoCodes – GMC – P208A GMC

P208A GMC Code - Reductant Pump Control Circuit

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: P208A GMC indicates Reductant Pump Control Circuit.
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 995

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 P208A 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 an open circuit in the control circuit.

OBDII Code P208A GMC - Reductant Pump Control Circuit - AutoCodes.com — P208A GMC Code - Reductant Pump Control Circuit

What does this mean?

What are the Possible Causes of the DTC P208A 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 P208A 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 P208A 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 P208A GMC Code

1. What are common symptoms of OBDII code P208A GMC related to the Reductant Pump Control Circuit?

- Common symptoms include the Check Engine Light coming on, decreased fuel efficiency, and potential failure to pass emissions testing.

2. What are some possible causes of OBDII code P208A GMC?

- Possible causes include a faulty reductant pump, damaged wiring or connectors in the control circuit, or a malfunctioning reductant heater.

3. How can I diagnose the issue causing OBDII code P208A GMC?

- Diagnosis typically involves using a scan tool to check for the specific error code, inspecting the reductant pump and related components, and testing the wiring and connectors for continuity.

4. Can I continue driving with OBDII code P208A GMC active?

- It is generally not recommended to continue driving with this code active, as it can lead to increased emissions and potential damage to the vehicle's emissions control system.

5. How can I repair OBDII code P208A GMC related to the Reductant Pump Control Circuit?

- Repair typically involves replacing the faulty reductant pump, repairing or replacing damaged wiring or connectors, and ensuring proper functioning of the reductant heater.

6. Are there any preventive maintenance tips to avoid OBDII code P208A GMC in the future?

- Regularly inspecting and maintaining the reductant pump, wiring, and connectors can help prevent issues that lead to this code. Also, using high-quality diesel exhaust fluid (DEF) can help maintain proper reductant system function.

7. Is it possible to reset OBDII code P208A GMC without making any repairs?

- While clearing the code may temporarily turn off the Check Engine Light, it is not recommended to reset the code without addressing the underlying issue, as it may lead to continued problems and emissions non-compliance.

8. Can a DIY enthusiast repair OBDII code P208A GMC at home?

- Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to diagnose and repair this code at home. However, dealing with emissions control systems can be complex, so professional assistance is often recommended.

9. How long does it typically take to repair OBDII code P208A GMC at a mechanic's shop?

- The repair time can vary based on the exact cause of the code and the shop's workload. In general, it may take a few hours to a full day to diagnose and repair the issue related to the Reductant Pump Control Circuit.

10. Will OBDII code P208A GMC cause any long-term damage if left unaddressed?

- Ignoring this code can lead to increased emissions, reduced fuel efficiency, and potential damage to the vehicle's emissions control system over time. It is advisable to address the issue promptly to prevent further complications.