P0601
High SeverityECM/PCM Memory Check Sum Error
Electrical System
What Does P0601 Mean?
The ECM internal memory has a checksum error, indicating data corruption.
Common Fix
ECM reflash or replacement
Estimated Cost (DIY)
$100 - $800
Symptoms
- ⚠️Multiple random codes
- ⚠️Erratic engine behavior
- ⚠️Check engine light
Common Causes
ECM software corruptionlikely
ECM hardware failurepossible
Low voltage during updatepossible
How to Diagnose P0601
- 1Try ECM reflash/reprogram
- 2Check battery and charging system
- 3Replace ECM if reflash fails
Need to read or clear this code?
Shop OBD2 Scanners on Amazon →Frequently Asked Questions
- Can an ECM be reprogrammed?
- Yes — many ECM issues are solved by reflashing the latest software. Dealers and some shops can do this for $100-$200.
- What causes ECM corruption?
- Voltage spikes, jump-starting incorrectly, or low battery voltage during a software update.