The P1352 diagnostic trouble code is a manufacturer-specific powertrain code. Its exact definition depends heavily on the vehicle make, pointing to an ignition coil circuit fault, an ignition control module output issue, or a diesel glow plug relay malfunction.
Because this code targets entirely different systems across manufacturers, the exact vehicle application must be verified before diagnosis. The code alone does not prove a specific component has failed without proper testing.
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Key Takeaways
- P1352 is a manufacturer-specific powertrain code with differing definitions depending on the vehicle make.
- On GM applications, it indicates an Ignition Control Module Output High or Pulse Detected When Grounded for Cylinder 2.
- On Ford and Jeep applications, it points to an Ignition Coil ‘B’ Primary or Secondary Circuit Malfunction.
- On Peugeot and Citroen diesel applications, it indicates a Pre-Post Heating Relay (glow plug) circuit fault.
- Diagnosis requires verifying the exact factory definition and testing the relevant ignition coil, control module, or relay circuit.
P1352 Code Description and Implications
The P1352 code indicates that a control module has detected a specific fault within the ignition or diesel pre-heating systems. Because it is a manufacturer-specific code, the exact monitored component varies significantly by brand.
Some GM and Chevrolet applications: P1352 indicates an Ignition Control Module (ICM) Output High or Pulse Detected When Grounded for Cylinder 2. The Powertrain Control Module (PCM) detects an unexpected voltage state in the ignition coil control circuit.
Certain Ford and Jeep applications: The code indicates an Ignition Coil ‘B’ Primary or Secondary Circuit Malfunction. The PCM detects an electrical open, short, or performance issue in the circuit controlling the ignition coil for cylinder 2.
Some Peugeot and Citroen diesel applications: P1352 indicates a Pre-Post Heating Relay circuit fault, pointing to an electrical issue in the glow plug relay control system.
Common Causes of the P1352 Code
Because P1352 applies to different systems across different brands, the root cause depends on the verified vehicle application.
GM Causes: A failing ignition control module, damaged wiring harness between the PCM and the ICM, poor electrical grounds, or a failing ignition coil for cylinder 2.
Ford and Jeep Causes: A failing ignition coil, damaged primary or secondary wiring, poor electrical connections at the coil connector, or a failing PCM driver.
Peugeot and Citroen Diesel Causes: A failing glow plug relay, damaged wiring harness, blown fuse, or a failing engine control unit driver.
Symptoms Associated With P1352
When the control module detects a critical system fault, it illuminates a warning light and may alter vehicle operation.
Warning Lights: The Check Engine Light will illuminate. On diesel applications, a glow plug warning light may also flash on the instrument cluster.
Drivability: On gasoline applications, the vehicle may experience severe engine misfires, rough idling, and a loss of power during acceleration. On diesel applications, hard cold starting and excessive white smoke may occur.
Diagnosing the P1352 Trouble Code
Accurate diagnosis begins by verifying the exact vehicle application and reviewing manufacturer-specific service information.
For GM applications: Inspect the ignition control module and cylinder 2 ignition coil wiring. Verify the applicable control, power, and ground circuits according to the manufacturer procedure to identify the open or short.
For Ford and Jeep applications: Inspect the ignition coil for cylinder 2 and its connector. Test the primary and secondary coil resistance and verify the control circuit for proper voltage and grounding.
For Peugeot and Citroen diesel applications: Inspect the glow plug relay and its control circuit. Test the relay operation and verify voltage supply to the glow plug harness.
Repairing the P1352 Issue
Repairs must follow the confirmed root cause identified during diagnosis.
Ignition Circuit Repairs: If the ignition coil or control module wiring is damaged on gasoline applications, repair the harness and replace the confirmed failed coil or module.
Relay Repairs: If the glow plug relay or its control wiring fails testing on diesel applications, replace the confirmed failed relay and clear the codes.
Cost Considerations for P1352 Repairs
Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.
Replacing an ignition coil or a glow plug relay involves minimal to moderate labor. However, replacing an ignition control module or performing extensive wiring repairs requires more diagnostic time.
Prevention Strategies for Future Occurrences
Inspecting exposed wiring harnesses near the ignition coils and glow plug relays helps prevent short circuits caused by heat or chafing.
Keeping electrical connectors clean and secure helps prevent moisture intrusion and poor communication between the control module and the ignition components.
Troubleshooting Tips and Best Practices
Follow these practices to avoid misdiagnosis and ensure accurate repairs.
Do not assume the ignition coil has failed just because a circuit code is present: A damaged wire or poor ground is a frequent cause. Always verify the external wiring harness and connectors first.
Check for related codes: Look for accompanying misfire codes or specific cylinder codes, which might help pinpoint the exact circuit issue.
Verify your definition: Always confirm whether your specific vehicle uses the ignition coil, control module, or glow plug relay definition before ordering parts.
More OBD-II Codes
| P1324 | P1323 | P1322 | P1321 |
| P1320 | P1315 | P1353 | P1354 |
| P1355 | P1356 | P1357 | P1358 |
| P1351 | P1361 | P1362 | P0300 |
| P0301 | P0303 | P1364 | P1365 |
| P1366 | P1367 | P1368 | P1370 |
Frequently Asked Questions
Is P1352 a generic or manufacturer-specific code?
No. P1352 is a manufacturer-specific powertrain code. Its definition varies significantly by brand, indicating an ignition coil fault, an ignition control module issue, or a glow plug relay malfunction.
Can I drive my vehicle with a P1352 code?
The vehicle may remain drivable, but an ignition coil fault can cause severe engine misfires and catalytic converter damage. On diesel applications, cold starting will be difficult. Driving should be limited.
Will disconnecting the battery clear the P1352 code?
Disconnecting the battery might temporarily clear the code. However, it does not repair the underlying damaged wire, failed coil, or relay fault, and the code will return upon the next monitor cycle.
Can a bad spark plug cause a P1352 code?
On applications where P1352 indicates a secondary ignition circuit fault, a severely fouled or damaged spark plug can disrupt the secondary circuit, potentially contributing to the fault condition.
Does P1352 affect the transmission?
No. The P1352 code relates strictly to the engine ignition system or the diesel pre-heating system. It does not directly affect the automatic or manual transmission operation.
What Should You Do About the P1352 Code?
When a P1352 code appears, confirm the exact factory definition for your specific vehicle make and model. Because this code targets entirely different ignition and pre-heating systems depending on the manufacturer, applying the wrong diagnostic path will lead to misdiagnosis.
Follow the applicable manufacturer diagnostic procedure to test the relevant system and components. Once the root cause is confirmed, complete the necessary electrical repairs, coil replacements, or relay corrections before returning the vehicle to normal service.
