The OBD2 code P061C is a diagnostic trouble code (DTC) that indicates a problem with the Internal Control Module Engine RPM Performance. This code suggests that the engine control module (ECM) has detected a performance issue with the engine’s revolutions per minute (RPM) that is outside the normal expected range. It’s a signal that there might be an inconsistency or irregularity in the engine’s operation, which could affect the vehicle’s performance.
P061C quick overview
| Meaning | P061C: Internal Control Module Engine RPM Performance |
| Is it serious? | Yes, this code indicates a serious issue that can affect vehicle drivability and engine performance. |
| Possible causes | – Faulty Engine Control Module (ECM) – Incorrectly installed or loose cam sprocket – Broken wires or poor electrical connections – Sensor malfunctions (e.g., cam or crank sensors) |
| How to diagnose? | Check freeze frame data for RPM behavior Scan all modules for codes Inspect the ignition system, including spark plugs and coils Scope cam and crank sensors for signal integrity Test PCM powers and grounds |
P061C Meaning
When your car’s computer triggers a P061C code, it means there’s something off with how the engine’s speed is being monitored or controlled. This could be due to the brain of the engine, the ECM, not working right, or something mechanical like a loose part in the engine’s timing system.
It’s a bit like your car saying it can’t keep the engine running smoothly because it can’t figure out the right speed. Addressing this issue sooner rather than later is crucial because it directly impacts your car’s ability to run properly and safely.
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How to fix P061C – learn from mechanics
I looked into P061C service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Chrysler
Vehicle information 2012 Chrysler 200 Touring 3.6L
- Engine: 3.6L
- Location: Dalton, Georgia
Issue + repair history
- Vehicle stalls while driving at highway speeds.
- Stored OBD2 code: p061c.
- Sent vehicle to the dealer to have ECM replaced.
- After stall, takes over 30 minutes to restart.
Other OBD2 Codes + Test Results
- OBD2 Code: p061c- ETC level 2 RPM performance.
Mechanic suggestions
- Check freeze frame data for RPM behavior.
- Start with OEM plugs and proceed with coils replacement.
- Scan all modules for codes.
- Check Mode 6 data and freeze frame.
- Focus on cam and crank sensors, and ignition system.
Final fix
- Replaced ECM at the dealer.
Case #2: Ram
Vehicle information 2012 Ram 1500 SLT 5.7L
- Engine: 5.7L HEMI
- Location: Warsaw, Indiana
Issue + repair history
- Vehicle experiences a crank no-start condition.
- Diagnosed and replaced PCM.
- Vehicle still exhibits crank no-start condition and sets OBD2 code P061C.
- Found loose cam sprocket due to improper torque during previous cam, timing chain, and lifters replacement.
- Replaced cam sprocket to correct engine timing issue.
Other OBD2 Codes + Test Results
- OBD2 Code: P061c- ETC Level 2 RPM Performance.
Mechanic suggestions
- Check for spark, fuel pressure, battery health, and compression.
- Verify fuel injectors firing.
- Scope cam and crank sensors for signal integrity.
- Test PCM powers and grounds.
- Consider potential EMI from incorrect spark plugs.
Final fix
- Replaced cam sprocket to correct engine timing issue.
Case #3: Chevrolet
Vehicle information 2007 Chevrolet Silverado 3500 HD LT 6.6L
- Engine: 6.6L
- Location: Traer, Iowa
Issue + repair history
- PTO not engaging despite multiple attempts at relearn and reflashing.
- Reflash initially unsuccessful, triggered SDM (Airbag) light.
- Contacted GMUpfitters for assistance.
- Attempted relearn steps provided by GMUpfitters, still no success.
- Replaced ECM but issue persisted.
- Discovered broken wire and cleaned DF, repaired EGT sensor (DTC P2033).
- Customer requested bypassing electronic controls and opted for manual control.
Other OBD2 Codes + Test Results
- OBD2 Code: P061c – PTO not up rpms.
Mechanic suggestions
- Check transmission line pressures.
- Clear codes in the PTOM and engage PTO, replace ECM if DTC P061C persists.
- Ensure correct reflashing of ECM or BCM, consider software updates.
- Verify correct wiring and conditions for PTO engagement, such as park position and cruise control status.
Final fix
- Customer requested bypassing electronic controls and opted for manual control of the PTO unit.
How to diagnose P061C
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Diagnostic Step | Brief Explanation |
|---|---|
| Check freeze frame and Mode 6 data | Analyze the conditions under which the code was set to pinpoint the issue. |
| Scan all modules for codes | Identify if there are other related issues or codes that need attention. |
| Inspect ignition system | Ensure spark plugs, coils, and wires are functioning properly. |
| Scope cam and crank sensors | Verify the integrity of the signals from these sensors for proper timing and engine performance. |
| Test PCM powers and grounds | Ensure the Powertrain Control Module has proper electrical connections. |
| Check for mechanical issues | Look for any improperly installed components like cam sprockets that could affect engine timing. |
| Consider software updates or ECM reflashing | Update the vehicle’s software to ensure proper operation and fix known issues. |
These steps, derived from mechanics’ real-world experiences, highlight the importance of a comprehensive approach to diagnosing and fixing the P061C code. Whether it’s checking for simple electrical issues or delving into the engine’s timing mechanism, a thorough understanding and systematic approach are key to resolving this complex issue.
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko