P0606 on Citroen
PCM Processor Fault
P0606 on Citroen vehicles indicates pcm processor fault. Au7o has documented this code across 1 Citroen model — most commonly on C3. P0606 indicates an internal processor or performance fault within the powertrain control module (PCM) — essentially the engine's main computer has detected that one of its own internal circuits or processors is not functioning correctly. Because the PCM controls fuel, ignition, and many other functions, an internal fault can affect almost any aspect of engine operation. Symptoms range from no obvious effect to stalling, no-start, erratic running, or multiple unrelated trouble codes appearing together. This often points to the module itself, though power and ground supply issues can mimic it. Typical repair costs on Citroen range from $300 to $900, depending on the specific model and root cause.
Common Causes of P0606
- •Poor power or ground supply to the PCM
- •Corroded, loose, or damaged PCM connectors
- •Low system/battery voltage or charging system fault
- •Water intrusion or corrosion at the module
- •Internal PCM hardware/processor failure
- •Failed or corrupted PCM software needing reflash
- •Wiring damage affecting the PCM power/ground circuits
P0606 on Citroen by Model
Citroen C3(1 issue)
- Electric Power Steering Failure2002-2016
The C3 Mark I and II experience electric power steering failures caused by the column-mounted EPS motor and its control ECU. The steering becomes heavy without warning, which is particularly dangerous at low speeds during parking.
Looking for P0606 on a different make?
View P0606 across all makes →Frequently Asked Questions
What does P0606 mean on Citroen?▼
P0606 stands for "PCM Processor Fault." P0606 indicates an internal processor or performance fault within the powertrain control module (PCM) — essentially the engine's main computer has detected that one of its own internal circuits or processors is not functioning correctly. Because the PCM controls fuel, ignition, and many other functions, an internal fault can affect almost any aspect of engine operation. Symptoms range from no obvious effect to stalling, no-start, erratic running, or multiple unrelated trouble codes appearing together. This often points to the module itself, though power and ground supply issues can mimic it. On Citroen specifically, this code is documented across 1 model.
What causes P0606 on Citroen vehicles?▼
Common causes on Citroen: Poor power or ground supply to the PCM, Corroded, loose, or damaged PCM connectors, Low system/battery voltage or charging system fault, Water intrusion or corrosion at the module, Internal PCM hardware/processor failure. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0606 on a Citroen?▼
Repair costs on Citroen range from $300 to $900, depending on the specific model and root cause.
Which Citroen models have P0606 documented?▼
Au7o has documented P0606 on 1 Citroen model: C3.