AutoCodes – Generic – P208C

P208C Code - Reductant Pump Control Circuit Low

Quick Answer

The reductant pump assembly contains a diaphragm pressure pump, a pressure sensor, a purge valve, an outlet filter and an internal heating element. Common causes include Faulty Reductant Pump, Reductant Pump harness is open or shorted, Reductant Pump 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 indicates Reductant Pump Control Circuit Low.
Common causes: Common causes include Faulty Reductant Pump, Reductant Pump harness is open or shorted, Reductant Pump 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 28,208

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 Description

The reductant pump assembly contains a diaphragm pressure pump, a pressure sensor, a purge valve, an outlet filter and an internal heating element. The reductant pressure sensor provides feedback to Powertrain Control Module (PCM), which regulates system pressure by controlling pump speed using pulse width modulation. When PCM requests reductant injection, the reductant injector opens and the pump operates, filling reductant pressure line and injector and purging air from the system. When all air is purged, injector closes and pump builds pressure to 73 psi. (500 kPa). The system is then primed and injector provides DEF to the SCR catalyst as determined by PCM.
When the vehicle is shut down, PCM closes injector and actuates reductant purge valve, causing the pump to reverse flow and bleed down pressure on reductant pressure line. The PCM then opens injector to allow gas to enter reductant pressure line, which in turn allows the pump to purge all remaining DEF from the system and return it to reductant tank. The PCM closes injector and returns purge valve to forward position. The PCM commands glow plug control module to provide voltage to reductant pump assembly internal heating element when reductant temperature approaches 12°F (-11°C).

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

What does this mean?

What are the Possible Causes of the DTC P208C?

Faulty Reductant Pump
Reductant Pump harness is open or shorted
Reductant Pump circuit poor electrical connection

How to Fix the DTC P208C?

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 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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Information for Specific Makes

P208C Buick — Reductant Pump Control Circuit Low Voltage
P208C Cadillac — Reductant Pump Control Circuit Low Voltage
P208C Chevrolet — Reductant Pump Control Circuit Low Voltage
P208C Dodge — Diesel Exhaust Fluid Reductant Pump Control Circuit Low
P208C Ford — Reductant Pump Control Circuit Low
P208C GMC — Reductant Pump Control Circuit Low Voltage
P208C RAM — Diesel Exhaust Fluid Reductant Pump Control Circuit Low

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 Code

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

The common symptoms of P208C may 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?

Possible causes of P208C include a faulty reductant pump, damaged wiring or connectors in the control circuit, or issues with the powertrain control module.

3. How can I diagnose the cause of OBDII code P208C?

Diagnosing P208C involves using a scan tool to retrieve the code, checking the reductant pump and its circuit for any visible damage, and testing the pump's electrical connections.

4. Can a DIYer repair OBDII code P208C?

DIY repairs for P208C may be possible if you have the necessary tools and expertise. However, it is recommended to consult a professional mechanic for accurate diagnosis and repair.

5. Are there any simple repair tips for fixing OBDII code P208C?

Simple repair tips for P208C include checking and replacing any damaged wiring or connectors in the reductant pump control circuit and ensuring the pump is functioning properly.

6. Is it safe to continue driving with OBDII code P208C active?

It is not recommended to drive with P208C active, as it can lead to further damage to the reductant system and affect the vehicle's overall performance.

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

The cost of repairing P208C can vary depending on the specific cause of the issue, but it may involve replacing the reductant pump, repairing wiring, or addressing issues with the powertrain control module.

8. Can a faulty reductant pump cause OBDII code P208C?

Yes, a faulty reductant pump can trigger P208C if it is not functioning properly or has failed altogether.

9. What is the role of the reductant pump in the vehicle's emissions system?

The reductant pump is responsible for supplying the necessary fluid to the emissions system to help reduce harmful emissions from the vehicle's exhaust.

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

Regular maintenance of the reductant system, including checking for leaks, proper fluid levels, and keeping the system clean, can help prevent the recurrence of P208C in the future.