P1384 — 9 documented meanings by make

P1384 does not mean the same thing on every car — manufacturers reuse the number for different faults. 14 makes document it: Audi, BMW, Citroen, Ford, Honda, Jaguar, Mazda, Mercedes-Benz, Peugeot, Porsche, Saab, SEAT, Skoda, Volkswagen. Find your make below.

P1384 on Audi, SEAT, Skoda, Volkswagen

On Audi, SEAT, Skoda, Volkswagen vehicles P1384 is documented as: Control module 2 defective. P1384 is stored when the ECU sees malfunction on control module. 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 Audi, SEAT, Skoda, Volkswagen codes:

P1384 on BMW

On BMW vehicles P1384 is documented as: Knock sensor 3 circuit. P1384 points at knock sensor (sensor 3). The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related BMW codes:

P1384 on Citroen, Peugeot

On Citroen, Peugeot vehicles P1384 is documented as: VVT solenoid A. P1384 points at camshaft timing or VVT. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Citroen, Peugeot codes:

P1384 on Ford, Jaguar

On Ford, Jaguar vehicles P1384 is documented as: Variable valve timing solenoid A circuit. P1384 points at camshaft timing or VVT. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Ford, Jaguar codes:

P1384 on Honda

On Honda vehicles P1384 is documented as: Glow plug circuit.

Related Honda codes:

P1384 on Mazda

On Mazda vehicles P1384 is documented as: Inlet camshaft position actuator circuit, bank 1. P1384 points at camshaft timing or VVT (bank 1). The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Mazda codes:

P1384 on Mercedes-Benz

On Mercedes-Benz vehicles P1384 is documented as: Knock sensor 1 front left circuit. P1384 points at knock sensor (sensor 1, front left). The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Mercedes-Benz codes:

P1384 on Porsche

On Porsche vehicles P1384 is documented as: Knock sensor 1 implausible signal. P1384 is stored when the ECU sees range or performance on knock sensor (sensor 1). 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: Sensor reading is inside its electrical range but does not match reality; Contamination or deposits changing what the sensor sees; A mechanical fault upstream that the sensor is correctly reporting; Sensor drifted with age without failing outright.

Check first, cheapest first:

1. Compare the live value against a second sensor or a known-good figure — this code is about plausibility, not a dead circuit
2. Look for the mechanical cause first: leaks, restrictions or wear that would genuinely produce this reading
3. Clean the sensor if it is the type that fouls
4. Check freeze-frame data to see under what conditions it triggered
5. Replace the sensor only after the mechanical side is ruled out

Related Porsche codes:

P1384 on Saab

On Saab vehicles P1384 is documented as: Glow control unit, short circuit to ground. P1384 is stored when the ECU sees short to ground on control module. 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 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:

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 P1384 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.