P1355 GMC Code - Ignition Control Module Output High/Pulse Detected When Grounded Cylinder 5
Quick Answer
The Ignition Control Module (ICM) has independent power and ground circuits. Common causes include Faulty Ignition Control Module, Ignition Control Module harness is open or shorted, Ignition 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
- P1355 GMC indicates Ignition Control Module Output High/Pulse Detected When Grounded Cylinder 5.
- Common causes
- Common causes include Faulty Ignition Control Module, Ignition Control Module harness is open or shorted, Ignition 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.
Code P1355 GMC Description
-The ignition control (IC) timing signal
-The IC timing control
-The low resolution engine speed signal
-The medium resolution engine signal
-The camshaft position signal
-The low reference
The ICM sends 3X signals to the PCM, and controls the timing advance during engine cranking. The timing advance changes to PCM control after the following actions occur:
The PCM receives the second 3X signal
The PCM applies 5 volts to the ignition control (IC) timing signal circuit.
The ICM monitors the CKP sync signal when the engine is cranking. The CKP sync signal is passed from the CKP sensor to the ICM on the CKP sensor 2 signal circuit. The CKP sync signal is used to determine the correct cylinder pair and initiate the ignition coil firing sequence. The 18X reference pulses are passed from the CKP sensor to the ICM on the CKP sensor 1 circuit. The 18X reference pulses are used for fuel injection and ignition control. After the ICM receives both signals, the ICM passes the 18X and 3X reference signals to the PCM. The CMP and the CKP sensors share a 12 volt reference and low reference circuit. The CKP sensor consists of the following circuits:
-A 12 volt reference
-A low reference
-A CKP sensor 1 signal
-A CKP sensor 2 signal
What are the Possible Causes of the DTC P1355 GMC?
- Faulty Ignition Control Module
- Ignition Control Module harness is open or shorted
- Ignition Control Module circuit poor electrical connection
How to Fix the DTC P1355 GMC?
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 P1355 GMC 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 P1355 GMC code?
Need more information on how to fix the P1355 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1355 GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1355 GMC Code
What does the OBDII code P1355 mean for a GMC vehicle?
P1355 indicates an Ignition Control Module (ICM) output high or pulse detected when grounded for cylinder 5. This typically points to an issue with the ignition system or wiring.
What are the common symptoms of code P1355 in a GMC?
Symptoms may include engine misfires, rough idling, poor acceleration, reduced fuel efficiency, and the check engine light turning on.
What causes the P1355 code in a GMC?
Common causes include a faulty Ignition Control Module (ICM), damaged ignition coil for cylinder 5, wiring issues, or a malfunctioning crankshaft position sensor.
Can a faulty spark plug cause code P1355?
While unlikely, a worn-out or damaged spark plug for cylinder 5 could contribute to ignition problems, but the primary issue is usually with the ICM or related components.
How can I diagnose the P1355 code on a GMC vehicle?
Start by inspecting the ignition coil, spark plug, and wiring for cylinder 5. Use a multimeter to check the ICM and related circuits for proper voltage and continuity.
Is the P1355 code specific to cylinder 5?
Yes, the code specifically refers to ignition control issues related to cylinder 5 in the engine.
Can driving with code P1355 damage my GMC engine?
Driving with this code may cause engine misfires, leading to potential damage to the catalytic converter or other engine components over time.
How do you fix the P1355 code on a GMC?
Repairs may include replacing the Ignition Control Module (ICM), ignition coil, or crankshaft position sensor, and repairing or replacing damaged wiring.
Will clearing the P1355 code fix the problem?
Clearing the code will turn off the check engine light temporarily, but it won’t resolve the underlying issue causing the code. Proper diagnosis and repairs are necessary.
Can a failing crankshaft position sensor trigger the P1355 code in a GMC?
Yes, a failing crankshaft position sensor can disrupt ignition timing and contribute to the P1355 code.
Discuss the causes and fixes for P1355 GMC OBDII Code
Code P1355 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
