P1652 — 15 documented meanings by make
Documented by: AUDI, CHRYSLER, CITROEN, FORD, HYUNDAI, KIA, MAZDA, PEUGEOT, SAAB, SEAT, SKODA, TOYOTA, VOLKSWAGEN, VOLVO — the meaning can differ between manufacturers
P1652 does not mean the same thing on every car — manufacturers reuse the number for different faults. 14 makes document it: Audi, Chrysler, Citroen, Ford, Hyundai, Kia, Mazda, Peugeot, Saab, SEAT, Skoda, Toyota, Volkswagen, Volvo. Find your make below.
| Make | Documented meaning | Points at |
|---|---|---|
| Audi | Memory of gearbox control unit | transmission |
| SEAT | Memory of gearbox control unit | transmission |
| Skoda | Memory of gearbox control unit | transmission |
| Volkswagen | Memory of gearbox control unit | transmission |
| Chrysler | J1850 communication bus | |
| Citroen | Idle air control monitor disabled by power steering pressure failed on | steering |
| Ford | PSP switch input malfunction | |
| Hyundai | Ignition switch | |
| Kia | Ignition switch circuit | |
| Mazda | Idle air control monitor disabled by PSPS failed on | |
| Peugeot | Fuel Pump Monitor Circuit Low Input | fuel supply · signal too low |
| Saab | ROM fault | |
| Saab | Main relay coil, open circuit | open circuit |
| Saab | Main relay coil, short circuit to ground | short to ground |
| Saab | Main relay circuit, voltage drops too late | |
| Saab | Main relay circuit, no voltage to control module | control module |
| Toyota | Idle air control valve control circuit | |
| Volvo | Safety fuel cut-off |
P1652 on Audi, SEAT, Skoda, Volkswagen
On Audi, SEAT, Skoda, Volkswagen vehicles P1652 is documented as: Memory of gearbox control unit. P1652 points at transmission. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.
Related Audi, SEAT, Skoda, Volkswagen codes:
P1652 on Citroen
On Citroen vehicles P1652 is documented as: Idle air control monitor disabled by power steering pressure failed on. P1652 points at steering. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.
Related Citroen codes:
P1652 on Ford
On Ford vehicles P1652 is documented as: PSP switch input malfunction. P1652 is stored when the ECU sees malfunction on the circuit named in the code. That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it, which is why the checks below start with the cheapest.
Usually one of: Wiring or connector fault in the circuit; Component failed electrically; Supply or ground problem feeding the circuit; Controlling module fault, though this is the least common of the four.
Check first, cheapest first:
- Read all stored codes — a general fault code is often the symptom of a more specific one
- Inspect the connector and wiring for the named component
- Check supply and ground at the component
- Measure the component against specification
- Replace the component once wiring and supply are ruled out
Related Ford codes:
P1652 on Peugeot
On Peugeot vehicles P1652 is documented as: Fuel Pump Monitor Circuit Low Input. P1652 is stored when the ECU sees signal too low on fuel supply. That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it, which is why the checks below start with the cheapest.
Usually one of: High resistance in the supply or ground path, dragging the signal down; Corroded connector adding resistance the module reads as a low reading; Sensor drifted out of tolerance with age; Partial short to ground somewhere in the signal line.
Check first, cheapest first:
- Read the live value on a scanner and compare with a known-good reading
- Clean and re-seat the connector, then re-test before replacing anything
- Check the ground point for that circuit — a poor ground causes this far more often than a bad sensor
- Measure the sensor against specification with the connector back-probed
- Replace the sensor only once the wiring and ground have been ruled out
Related Peugeot codes:
P1652 on Saab
On Saab vehicles P1652 is documented as: ROM fault; Main relay coil, open circuit; Main relay coil, short circuit to ground; Main relay circuit, voltage drops too late; Main relay circuit, no voltage to control module. P1652 is stored when the ECU sees malfunction on the circuit named in the code. That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it, which is why the checks below start with the cheapest.
Usually one of: Wiring or connector fault in the circuit; Component failed electrically; Supply or ground problem feeding the circuit; Controlling module fault, though this is the least common of the four.
Check first, cheapest first:
- Read all stored codes — a general fault code is often the symptom of a more specific one
- Inspect the connector and wiring for the named component
- Check supply and ground at the component
- Measure the component against specification
- Replace the component once wiring and supply are ruled out
Related Saab codes:
Which one is yours
A generic OBD reader gives you the number, not which of these meanings your manufacturer assigned to it. To get to the specific one:
- Use a brand-specific scanner — VCDS for VAG, INPA or ISTA for BMW, XENTRY for Mercedes, Forscan for Ford. It shows the manufacturer's own text rather than the generic one.
- Read all stored codes together — the neighbouring ones usually point at which system is involved and narrow the list.
- Check freeze-frame data: the RPM, temperature and load at the moment it triggered indicate which system was active.
- If you have no brand scanner, tell me the make and model below and I will tell you which of these applies to your car.
Code family
P1xxx is manufacturer-specific code (VW/Audi, BMW, Mercedes, Toyota etc. have different meanings for the same code number).
Severity
Manufacturer-specific codes need a brand scanner (VCDS for VAG, INPA for BMW, STAR for Mercedes).
That is what holds for P1652 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.
Why TorqFix for your car?
Above is what the code means and why it appears. TorqFix goes further — it gives you specific procedures, torque values, wiring diagrams and pinouts for your exact engine, not generic steps for every car. Real workshop data (127,000+ diagrams, 10,000+ procedures), interpreted by AI in your language.
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Code breakdown
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
The same code can mean different things on different makes. Match the meaning to your make before acting on it.
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