OBD Guide
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P0669

Control Module Internal Temperature Sensor A Circuit High

P0669 is an OBD-II diagnostic trouble code meaning: Control Module Internal Temperature Sensor A Circuit High. Common causes: short circuit of the signal wire to the power line (+12 v), temperature sensor ground circuit open. Estimated repair cost: $33–889.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–889 (est.)

Symptoms

  • The Check Engine light comes on
  • Switching to emergency engine operation mode
  • Reduced power and throttle response
  • Unstable operation of the vehicle's electronic systems
  • Possible overheating of the ECU

Causes

  • Short circuit of the signal wire to the power line (+12 V)
  • Temperature sensor ground circuit open
  • ECU internal temperature sensor malfunction
  • Oxidation or contamination of the ECU connector
  • Internal ECU fault

How to Fix

  1. Read error codes and record data freeze frame with OBD-II scanner
  2. Inspect the ECU connectors and wiring for damage, oxidation, and traces of moisture.
  3. Measure temperature sensor A signal circuit voltage (normal: 0.5 - 4.5 V)
  4. Check the sensor ground circuit with a multimeter for an open circuit.
  5. Check signal wire for short circuit to +12 V
  6. If the external circuit is in good condition - diagnostics of the ECU with possible replacement

Related codes

P0668P0597P0598P0599

Error P0669 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0669 code mean?

P0669 is an OBD-II diagnostic trouble code that indicates: Control Module Internal Temperature Sensor A Circuit High

What causes a P0669 error code?

The most common causes of P0669 include: Short circuit of the signal wire to the power line (+12 V); Temperature sensor ground circuit open; ECU internal temperature sensor malfunction; Oxidation or contamination of the ECU connector.

How do I fix a P0669 diagnostic trouble code?

To fix P0669: Read error codes and record data freeze frame with OBD-II scanner. Inspect the ECU connectors and wiring for damage, oxidation, and traces of moisture.. Measure temperature sensor A signal circuit voltage (normal: 0.5 - 4.5 V). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0669?

Limited driving only, diagnose soon

How much does it cost to fix P0669?

The estimated repair cost for P0669 is $33–889. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat