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ECU Internal Fault:
P0601 indicates an internal control module or memory failure inside the Bosch EDC16C39 ECU. This is not a sensor fault and will not be fixed by clearing codes.
What Does Fault Code P0601 Mean?
On vehicles fitted with the Bosch EDC16C39 diesel ECU, fault code P0601 means the engine control unit has detected an internal memory or processor error. The ECU performs self-checks at key-on and during operation. When these checks fail, P0601 is stored.
Common Vehicles Affected
- Peugeot & Citroën HDi models
- Ford TDCi vehicles
- Volvo D5 / D models
- Fiat / Alfa Romeo diesel engines
- Various PSA and VAG diesel platforms
Common Causes
- Corrupted ECU flash or EEPROM memory
- Internal processor failure
- Voltage spikes or jump-start damage
- Water ingress into the ECU casing
- Failed ECU software update or coding
Typical Symptoms
- Engine warning light illuminated
- Vehicle may not start or stalls randomly
- Limp mode or reduced performance
- Multiple unrelated fault codes stored
- P0601 returns immediately after clearing
Our Bosch EDC16C39 P0601 Repair Solution
Main dealers usually condemn the ECU and quote for full replacement and coding. We specialise in ECU-level repair: memory reconstruction, processor checks, software reflash, and bench testing. In most cases, the original ECU can be repaired and refitted, avoiding replacement costs.