AutoCodes – GMC – P208C GMC

P208C GMC Code - Reductant Pump Control Circuit Low 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: P208C GMC indicates Reductant Pump Control Circuit Low 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 1,046

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 P208C 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 ground in the control circuit.

OBDII Code P208C GMC - Reductant Pump Control Circuit Low Voltage - AutoCodes.com — P208C GMC Code - Reductant Pump Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P208C 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 P208C 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 P208C 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 P208C GMC Code

1. What are the common symptoms of OBDII code P208C GMC (Reductant Pump Control Circuit Low Voltage)?

- Common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P208C GMC?

- Possible causes include a faulty reductant pump, damaged wiring or connectors in the control circuit, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the issue related to code P208C GMC?

- Diagnose by checking the reductant pump for proper operation, inspecting the wiring and connectors for any damage, and using a scan tool to analyze the control circuit voltage.

4. What are some repair tips for resolving OBDII code P208C GMC?

- Repair tips include replacing the faulty reductant pump, repairing any damaged wiring or connectors, and resetting the fault codes using a scan tool after completing repairs.

5. Can driving with OBDII code P208C GMC cause further damage to the vehicle?

- Continuing to drive with this code may lead to decreased engine efficiency and potential damage to the emissions control system, so it is recommended to address the issue promptly.

6. Is it safe to ignore OBDII code P208C GMC and continue driving the vehicle?

- Ignoring this code can result in poor engine performance and potential emissions issues, so it is not advisable to ignore it. It's best to have the issue diagnosed and repaired as soon as possible.

7. How much does it typically cost to repair OBDII code P208C GMC?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve parts and labor expenses ranging from $200 to $500 or more.

8. Can I reset OBDII code P208C GMC without fixing the underlying issue?

- While you can reset the code using a scan tool, the underlying issue causing the code will persist. It is recommended to address the root cause of the problem to prevent further issues.

9. Will OBDII code P208C GMC cause my vehicle to fail an emissions test?

- Yes, having this code stored in the vehicle's system may cause it to fail an emissions test due to potential issues with the reductant pump control circuit.

10. How can I prevent OBDII code P208C GMC from recurring in the future?

- To prevent the code from recurring, it's important to perform regular maintenance on the emissions control system, address any issues promptly, and follow the manufacturer's recommended service schedule.