GM Engine Error Code P1351: How to Fix It

Medium 1-3 hours High Severity Verified June 2026
Error Code
P1351
Brand
GM
Product Type
automotive
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
1-3 hours
GM error code P1351 indicates an ignition control circuit high voltage condition, meaning the engine control module has detected abnormally high voltage in the ignition control system. This can cause engine misfires, rough idling, and poor performance if not addressed promptly.
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Tools You'll Need

How to Fix Error Code P1351

  1. Turn off engine and ensure safety

    Always disconnect the battery before working on ignition components to prevent electrical shock or damage to electronic systems.
  2. Retrieve and document the error code

  3. Inspect ignition coil pack connections

  4. Test ignition coil pack resistance

  5. Check ignition control module wiring

    Handle wiring carefully to avoid creating additional damage or short circuits.
  6. Test ignition control module

  7. Clear codes and test drive

Parts You May Need

Ignition coil pack
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Ignition control module
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Wiring harness repair kit
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Electrical connectors
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Ignition coil pack
Check Price on Amazon
Ignition control module
Check Price on Amazon
Wiring harness repair kit
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Ignition coil pack
Check Price on Amazon
Ignition control module
Check Price on Amazon
Wiring harness repair kit
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Ignition coil pack
Check Price on Amazon
Ignition control module
Check Price on Amazon
Wiring harness repair kit
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Ignition coil pack
Check Price on Amazon
Ignition control module
Check Price on Amazon
Wiring harness repair kit
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Ignition coil pack
Check Price on Amazon
Ignition control module
Check Price on Amazon
Wiring harness repair kit
Check Price on Amazon
Electrical connectors
Check Price on Amazon
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When to Call a Professional

Call a professional mechanic if you're uncomfortable working with electrical components, if multiple ignition system codes are present, or if the problem persists after replacing obvious faulty parts. Complex ignition system diagnostics may require specialized equipment.

Frequently Asked Questions

What causes GM P1351 error code?
P1351 is typically caused by a faulty ignition coil pack, damaged wiring in the ignition control circuit, a failing ignition control module, or poor electrical connections in the ignition system.
Can I drive with P1351 error code?
You should avoid driving with P1351 as it indicates ignition system problems that can cause engine misfires, potential catalytic converter damage, and unsafe driving conditions. Address the issue promptly.
How much does it cost to fix P1351?
Repair costs vary from $50-150 for ignition coil replacement to $200-500 for ignition control module replacement, plus labor. Professional diagnosis typically costs $100-150.
Will P1351 cause my car to not start?
P1351 may cause hard starting, rough running, or engine stalling, but complete no-start conditions are less common. The vehicle may start but run poorly with reduced power and fuel economy.