P1662 — 12 documented meanings by make

P1662 does not mean the same thing on every car — manufacturers reuse the number for different faults. 12 makes document it: Audi, Chevrolet (USA), Citroen, Ford, Mazda, Peugeot, Saab, SEAT, Skoda, Toyota, Volkswagen, Volvo. Find your make below.

P1662 on Audi, SEAT, Skoda, Volkswagen

On Audi, SEAT, Skoda, Volkswagen vehicles P1662 is documented as: Radiator fan activation stage 2, short circuit to ground. P1662 is stored when the ECU sees short to ground on cooling system. 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 insulation chafed through where the loom passes a bracket or edge; Water or salt in a connector bridging the signal pin to the body; The component itself shorted internally; A harness pinched during earlier repair work.

Check first, cheapest first:

1. Unplug the component and re-read the code — if it changes, the fault is in the component, not the wiring
2. Inspect the loom where it passes metal edges, brackets and hinges
3. Open the connector and check for green corrosion or moisture
4. Measure resistance from the signal pin to a body ground; near-zero confirms the short
5. Repair the harness section, or replace the component if it shorted internally

Related Audi, SEAT, Skoda, Volkswagen codes:

P1662 on Chevrolet (USA)

On Chevrolet (USA) vehicles P1662 is documented as: Speed control inhibit control circuit.

Related Chevrolet (USA) codes:

P1662 on Citroen

On Citroen vehicles P1662 is documented as: IDM EN circuit failure. P1662 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:

1. Read all stored codes — a general fault code is often the symptom of a more specific one
2. Inspect the connector and wiring for the named component
3. Check supply and ground at the component
4. Measure the component against specification
5. Replace the component once wiring and supply are ruled out

Related Citroen codes:

P1662 on Ford

On Ford vehicles P1662 is documented as: EDU_EN output circuit; Injector driver module enable circuit.

Related Ford codes:

P1662 on Mazda

On Mazda vehicles P1662 is documented as: Injector driver module failure. P1662 is stored when the ECU sees malfunction on fuel injector. 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:

1. Read all stored codes — a general fault code is often the symptom of a more specific one
2. Inspect the connector and wiring for the named component
3. Check supply and ground at the component
4. Measure the component against specification
5. Replace the component once wiring and supply are ruled out

Related Mazda codes:

P1662 on Peugeot

On Peugeot vehicles P1662 is documented as: Power Steering Output Circuit Malfunction. P1662 is stored when the ECU sees malfunction on steering. 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:

1. Read all stored codes — a general fault code is often the symptom of a more specific one
2. Inspect the connector and wiring for the named component
3. Check supply and ground at the component
4. Measure the component against specification
5. Replace the component once wiring and supply are ruled out

Related Peugeot codes:

P1662 on Saab

On Saab vehicles P1662 is documented as: Charge air control valve, open circuit; Charge air control valve, short circuit to ground; Fuel cut-off control valve, short circuit to positive. P1662 is stored when the ECU sees open circuit on turbocharger or boost control. 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: Broken wire, most often at a flex point such as a door hinge or engine mount; Corroded or pushed-back terminal in the connector; Blown fuse on the supply side; Component failed with an internally open winding or element.

Check first, cheapest first:

1. Check the relevant fuse first — it is the cheapest thing that produces this code
2. Unplug and inspect both halves of the connector for corrosion and terminal fit
3. Continuity-test the wire end to end while flexing the loom by hand
4. Measure the component itself against its specification
5. Repair the break or replace the component, whichever the measurement points to

Related Saab codes:

P1662 on Toyota

On Toyota vehicles P1662 is documented as: Exhaust gas recirculation bypass valve control circuit. P1662 points at EGR system. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Usually one of: Valve stuck with carbon deposits; Cooler blocked or leaking; Vacuum or electrical control fault; Position sensor reading wrongly.

Check first, cheapest first:

1. Remove the valve and inspect for carbon — cleaning fixes a large share of these
2. Command the valve with a scanner and watch whether it moves
3. Check the vacuum line or electrical connector depending on the type fitted
4. Replace the valve if it will not move when commanded and cleaned

Related Toyota codes:

P1662 on Volvo

On Volvo vehicles P1662 is documented as: Cruise control lever and logic. P1662 points at cruise control. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Volvo 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:

1. 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.
2. Read all stored codes together — the neighbouring ones usually point at which system is involved and narrow the list.
3. Check freeze-frame data: the RPM, temperature and load at the moment it triggered indicate which system was active.
4. 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 P1662 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.