AutoCodes – Chevrolet – P129C 2015 Chevrolet Silverado

P129C 2015 Chevrolet Silverado Code - Fuel Pump Driver Control Module System Voltage High

Quick Answer

The Fuel Pump Power Control Module monitors the battery positive voltage circuit to verify the voltage is within the normal operating range. Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver Control Module 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: P129C 2015 Chevrolet Silverado indicates Fuel Pump Driver Control Module System Voltage High.
Common causes: Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver Control Module 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 254

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 04, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P129C 2015 Chevrolet Silverado Description

The Fuel Pump Power Control Module monitors the battery positive voltage circuit to verify the voltage is within the normal operating range. The Diagnostic Trouble Code (DTC) will be set when the Fuel Pump Driver Control Module detects the battery positive voltage is greater than 18 V for 1 s.

OBDII Code P129C 2015 Chevrolet Silverado - Fuel Pump Driver Control Module System Voltage High - AutoCodes.com — P129C 2015 Chevrolet Silverado Code - Fuel Pump Driver Control Module System Voltage High

What does this mean?

What are the Possible Causes of the DTC P129C 2015 Chevrolet Silverado?

Faulty Fuel Pump Driver Control Module
Fuel Pump Driver Control Module harness is open or shorted
Fuel Pump Driver Control Module circuit poor electrical connection

How to Fix the DTC P129C 2015 Chevrolet Silverado?

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 P129C 2015 Chevrolet Silverado 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.

Need more information about the P129C 2015 Chevrolet Silverado code?

Need more information on how to fix the P129C 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 P129C 2015 Chevrolet Silverado Code

1. What does the OBDII code P129C mean on a 2015 Chevrolet Silverado?

P129C indicates a "Fuel Pump Driver Control Module System Voltage High" issue, where the fuel pump control module detects an abnormally high voltage in its circuit.

2. What are the common symptoms of P129C on a 2015 Chevrolet Silverado?

Symptoms may include difficulty starting the engine, reduced fuel efficiency, poor engine performance, or the vehicle entering limp mode.

3. What causes the P129C code to appear on a Chevy Silverado?

Common causes include a faulty fuel pump driver control module, wiring issues such as damaged or corroded connections, or a failing fuel pump.

4. Can a bad battery cause the P129C code in a 2015 Silverado?

Yes, a failing or overcharging battery, as well as a malfunctioning alternator, can cause voltage irregularities leading to this code.

5. How is the P129C code diagnosed on a 2015 Chevrolet Silverado?

Technicians will typically inspect the fuel pump driver control module, check the associated wiring and connectors, measure system voltage, and verify the fuel pump's functionality.

6. Can I drive my 2015 Silverado with the P129C code?

Driving with this code is not recommended, as it can lead to poor performance, potential stalling, or damage to other components in the fuel system.

7. How do you fix the P129C code on a 2015 Chevrolet Silverado?

Repairs may involve replacing the fuel pump driver control module, repairing or replacing damaged wiring, or addressing battery and alternator issues.

8. How much does it cost to fix the P129C code on a 2015 Silverado?

Repair costs can vary, but replacing the fuel pump control module typically ranges from $300 to $600, depending on parts and labor.

9. Can a software update fix the P129C code on a 2015 Chevrolet Silverado?

In some cases, a software update for the fuel pump driver control module may resolve the issue if it is related to a programming error.

10. How can I prevent the P129C code from reoccurring in my 2015 Silverado?

Regularly inspect and maintain your vehicle's electrical system, including the battery, alternator, and wiring, to prevent voltage irregularities that trigger this code.