P1604
Critical Severity Repairable by ModuleMedicsP1604: Internal Control Module Malfunction
The TCM has logged an internal malfunction within its own circuitry.
Total Repair Cost
Repair Price
£249
Turnaround
~3 Days
Warranty
3 Months
Risk
No Fix, No Fee
How Payment Works
£249 Upfront
Full repair price paid to secure your booking
What This Fault Means
P1604 indicates the Transmission Control Module has detected an internal fault within its own circuitry. On the DQ200, this typically points to component degradation on the control board: failed drivers, memory corruption, or processor faults. The unit may still communicate intermittently before failing completely.
Common Symptoms
- Intermittent communication with the TCM
- Gearbox warning light on permanently
- Limp mode activation, especially when warm
- Fault clears on ignition cycle but returns
Common Causes
- Degraded internal processor or memory chip
- Failed solenoid driver circuit on the board
- Power supply regulation fault within the TCM
- Thermal stress damage to solder joints
Affected Vehicles
VW Golf, Audi A3, Škoda Octavia, SEAT Leon with DQ200 (2008–2021)
Affected Models — Get Your Vehicle Details
Total Repair Cost
Including insured delivery to us
How Payment Works
£249 Upfront
Full repair price paid now to secure your booking
Pay £249 upfront — £199 refunded if your unit can't be repaired.
Compatible Parts