OBD Guide
ENFRDEESPT

P0593

Cruise Control Multi-Function Input B Circuit High

P0593 is an OBD-II diagnostic trouble code meaning: Cruise Control Multi-Function Input B Circuit High. Common causes: input b signal wire short to power (+5 v or +12 v), violation of the reference voltage in the resistive circuit of the buttons. Estimated repair cost: $17–111.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–111 (est.)

Symptoms

  • Cruise control completely inoperable
  • Check Engine Light Illuminates
  • There is no response to any button on the control unit
  • Possible malfunction of adjacent steering wheel systems

Causes

  • Input B signal wire short to power (+5 V or +12 V)
  • Violation of the reference voltage in the resistive circuit of the buttons
  • Damage to the steering wheel cable with a short to power
  • ECU input stage malfunction (rare)
  • Incorrect type or malfunction of the installed button block

How to Fix

  1. Measure the voltage at input B with no buttons pressed (should not exceed 5 V)
  2. Check signal wire for short to power
  3. Inspect the steering wheel cable for damage
  4. Make sure that the type and configuration of the button block matches the vehicle
  5. Check the reference voltage in the button circuit
  6. If the wiring is correct, check the ECU input stage

Related codes

P0591P0592P0575P0565P0568

Error P0593 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0593 code mean?

P0593 is an OBD-II diagnostic trouble code that indicates: Cruise Control Multi-Function Input B Circuit High

What causes a P0593 error code?

The most common causes of P0593 include: Input B signal wire short to power (+5 V or +12 V); Violation of the reference voltage in the resistive circuit of the buttons; Damage to the steering wheel cable with a short to power; ECU input stage malfunction (rare).

How do I fix a P0593 diagnostic trouble code?

To fix P0593: Measure the voltage at input B with no buttons pressed (should not exceed 5 V). Check signal wire for short to power. Inspect the steering wheel cable for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0593?

Yes, but get it checked soon

How much does it cost to fix P0593?

The estimated repair cost for P0593 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat