AutoCodes – Chrysler – P0629 Chrysler

P0629 Chrysler Code - High Voltage Detected At The Fuel Lift Pump

Quick Answer

When the ignition switch is turned on The ECM will mobilize the fuel pump relay and run the in-tank fuel pump as soon as the ignition is switched ON. Common causes include Faulty Fuel Lift Pump, Fuel Lift Pump harness is open or shorted, Fuel Lift 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: P0629 Chrysler indicates High Voltage Detected At The Fuel Lift Pump.
Common causes: Common causes include Faulty Fuel Lift Pump, Fuel Lift Pump harness is open or shorted, Fuel Lift 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 3,431

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 May 01, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0629 Chrysler Description

When the ignition switch is turned on The ECM will mobilize the fuel pump relay and run the in-tank fuel pump as soon as the ignition is switched ON. The fuel pump will function till the engine cranks or runs, and the ECM continues to obtain ignition reference pulses.

OBDII Code P0629 Chrysler - High Voltage Detected At The Fuel Lift Pump - AutoCodes.com — P0629 Chrysler Code - High Voltage Detected At The Fuel Lift Pump

What does this mean?

What are the Possible Causes of the DTC P0629 Chrysler?

Faulty Fuel Lift Pump
Fuel Lift Pump harness is open or shorted
Fuel Lift Pump circuit poor electrical connection

How to Fix the DTC P0629 Chrysler?

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 P0629 Chrysler 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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Need more information on how to fix the P0629 Chrysler code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0629 Chrysler code diagnosed by a professional: Find a repair shop in your area

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 P0629 Chrysler Code

1. What does the OBDII code P0629 mean for a Chrysler vehicle?

P0629 indicates that the Engine Control Module (ECM) has detected a high voltage condition at the fuel lift pump circuit.

2. What are the common symptoms of a P0629 code on a Chrysler?

Symptoms may include difficulty starting the engine, reduced engine performance, stalling, or the check engine light being illuminated.

3. What causes the P0629 code to appear on a Chrysler?

Common causes include a faulty fuel lift pump, damaged wiring or connectors in the fuel pump circuit, a failing fuel pump relay, or a malfunctioning ECM.

4. Can I continue driving my Chrysler with a P0629 code?

Driving with a P0629 code is not recommended, as it can lead to poor engine performance or potential stalling, which may be unsafe.

5. How do I diagnose a P0629 code on a Chrysler?

Diagnosis involves checking the fuel lift pump, inspecting the wiring and connectors for damage, testing the fuel pump relay, and verifying ECM functionality.

6. How do I fix the P0629 code on my Chrysler?

Repairs may include replacing the fuel lift pump, fixing or replacing damaged wiring or connectors, replacing the fuel pump relay, or reprogramming or replacing the ECM if necessary.

7. Is a P0629 code specific to Chrysler vehicles?

No, P0629 is a generic OBDII code, but the troubleshooting steps may vary depending on the vehicle make and model.

8. Can a bad fuel pump relay cause the P0629 code?

Yes, a defective fuel pump relay can cause high voltage to be detected in the fuel lift pump circuit, triggering the P0629 code.

9. How much does it cost to repair a P0629 code on a Chrysler?

Repair costs can vary, but replacing a fuel lift pump typically costs $300-$700, while addressing wiring issues or replacing the fuel pump relay can be less expensive.

10. Can a weak battery cause the P0629 code to trigger?

A weak battery is unlikely to cause this code, but electrical issues related to the charging system can sometimes contribute to voltage irregularities in the fuel pump circuit.