Fuel temperature sensor internal failure shorting the signal wire to ground; Chafed or pinched sensor signal wire contacting chassis ground along the harness; Corroded, water-filled, or loose electrical connector at the fuel temperature sensor; Short to ground inside the engine wiring harness where it rubs against the engine or body; Failed ECM driver circuit on the sensor input, though this is uncommon; Contamination or damage to the sensor from fuel additives or debris in the fuel system

DTC codes / Volkswagen codes / P1162

P1162 · VolkswagenFuel Temperature Sensor Circuit Short To Ground

Q: What does code P1162 mean?

Fuel Temperature Sensor Circuit Short To Ground. P1162 on Volkswagen vehicles means the engine control module (ECM) has detected a short to ground on the fuel temperature sensor circuit, so the signal wire is being pulled to chassis ground instead of returning a valid voltage. The ECM stores this fault when the sensor input voltage stays below the expected threshold for the current operating conditions, which usually means the sensor, its wiring, or the connector has a ground-side fault.

P1162 on Volkswagen vehicles means the engine control module (ECM) has detected a short to ground on the fuel temperature sensor circuit, so the signal wire is being pulled to chassis ground instead of returning a valid voltage. The ECM stores this fault when the sensor input voltage stays below the expected threshold for the current operating conditions, which usually means the sensor, its wiring, or the connector has a ground-side fault.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Extended cranking or a slightly rough idle when the engine is cold
Poor fuel economy or black smoke from the tailpipe if the ECM substitutes a fixed fuel temperature value
Intermittent hesitation or stumble during acceleration in some driving conditions
A no-start condition in rare cases where the short also affects shared sensor reference voltage

Common causes, most likely first

Fuel temperature sensor internal failure shorting the signal wire to ground
Chafed or pinched sensor signal wire contacting chassis ground along the harness
Corroded, water-filled, or loose electrical connector at the fuel temperature sensor
Short to ground inside the engine wiring harness where it rubs against the engine or body
Failed ECM driver circuit on the sensor input, though this is uncommon
Contamination or damage to the sensor from fuel additives or debris in the fuel system

How to diagnose and fix it

Scan all modules and record freeze-frame data for P1162 before clearing any codes
Locate the fuel temperature sensor and inspect its connector and wiring for corrosion, chafing, or pinched sections
Disconnect the sensor and measure resistance across its terminals, comparing to the manufacturer's temperature-resistance chart
With the sensor unplugged and the key on, measure voltage on the signal wire at the connector to see if the short to ground remains
Isolate the harness by wiggling and flexing sections while watching live sensor data or a multimeter reading
Repair or replace the faulty sensor, connector terminal, or damaged section of harness as needed
Clear the fault codes, road test the vehicle through several warm-up cycles, and verify P1162 does not return

What a fuel temperature short really means

A short to ground on the fuel temperature sensor circuit often shares a five-volt reference or ground path with other engine sensors, so a single chafed wire can set multiple codes at once and mislead you into replacing unrelated parts.
The fuel temperature sensor on many Volkswagen engines is integrated into the fuel rail or fuel pressure sensor assembly, so technicians sometimes replace the entire expensive assembly when only a corroded connector terminal is at fault.
P1162 can be stored intermittently by a harness that rubs only during certain engine movements, which means a static resistance check at the sensor may pass while the fault is still present on the road.
A failed sensor that reads a fixed cold temperature can make the ECM enrich the mixture unnecessarily, causing soot buildup and fouled spark plugs that are mistaken for a separate ignition problem.
Do not condemn the ECM until you have load-tested the signal wire and confirmed the short is not in the harness, because ECM input failures are rare and expensive to misdiagnose.

Can I keep driving with P1162?

You can usually drive the vehicle short distances to a repair shop because the ECM substitutes a default fuel temperature value, but avoid heavy acceleration, towing, or long trips until the fault is repaired. If the engine runs rough, stalls, or refuses to start, stop driving and arrange a tow.

Tools that help

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Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.