P0601

Internal Control Module Memory Checksum Error

Q: Is it safe to drive with P0601?

No. When the module can't verify its own memory it may cut fueling, stall, or refuse to start. Have it diagnosed before relying on the vehicle.

Q: Can I just clear P0601?

Clearing rarely holds — an internal memory error returns immediately. Rule out battery voltage and grounds first, as those can trigger it without a bad ECM.

Engine control module (ECM) Generic OBD-II High

What it means

P0601 means the engine control module ran an internal check on its own memory and the result didn't match — a checksum error. The ECM can't fully trust its stored data, so the engine may not start, may stall, or drop into limp mode. Check battery voltage and grounds first, since those can trigger it without a failed module.

High

Can I keep driving? Not really — the ECM can't trust its own memory, so the engine may not start, may stall, or run in limp mode; treat it as a get-it-fixed-now fault.

Real-world scan data

Seen in

244

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0601 scans

P0501in 28.7% of scans

P0606in 28.7% of scans

P0604in 27.9% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on, often with other warning lights
No-start or intermittent stalling
Reduced power / limp mode
Erratic behavior across multiple systems

Common causes

Most likely first

Corroded, loose, or damaged ECM power and ground connectionsLikely
Low battery voltage or a weak charging system disrupting the moduleCommon
An interrupted or incorrectly installed software/reflash updateCommon
Internal ECM memory failureLess often

How to diagnose & fix

Work through it in order

Check the battery and charging system first — low or unstable voltage is a common trigger; clean and tighten battery and ground connections.
Inspect the ECM connectors and grounds for corrosion, damage, or looseness and repair as needed.
If the module was recently reflashed, have a technician re-flash it correctly with the latest calibration.
If voltage, grounds, and software are good and the checksum error persists, the ECM needs replacement and programming.

FAQ

Quick answers

Is it safe to drive with P0601?+

No. When the module can't verify its own memory it may cut fueling, stall, or refuse to start. Have it diagnosed before relying on the vehicle.

Can I just clear P0601?+

Clearing rarely holds — an internal memory error returns immediately. Rule out battery voltage and grounds first, as those can trigger it without a bad ECM.

Read & clear P0601 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX