OBD Guide
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P05CA

Economy Mode Switch Circuit High

P05CA is an OBD-II diagnostic trouble code meaning: Economy Mode Switch Circuit High. Common causes: short circuit of the signal wire of the switch to power (+12v or +5v), insulation damage with a short to an adjacent high-voltage wire. Estimated repair cost: $11–78.

Severity
✅ Low
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$11–78 (est.)

Symptoms

  • Check Engine light is on
  • Eco Mode button does not activate economy mode
  • Eco mode may stay on all the time (stuck)
  • The Eco indicator is not on the display or is constantly on
  • Minor change in fuel consumption or engine performance

Causes

  • Short circuit of the signal wire of the switch to power (+12V or +5V)
  • Insulation damage with a short to an adjacent high-voltage wire
  • Switch internal short to power (switch failure)
  • Moisture entering the connector, creating a path between the wires
  • Poor quality repairs or non-standard additional equipment

How to Fix

  1. Read the codes and data of the frozen frame with a scanner, pay attention to the conditions for the appearance of the code
  2. Find and inspect the Eco Mode switch, check the connector for moisture and damage
  3. Disconnect the switch connector and measure the voltage on the signal wire - if there is voltage without the switch connected, look for a short to power
  4. Inspect the wiring harness to the switch for bare spots, chafing, contact with other wires
  5. Check the switch itself with a multimeter for internal shorts
  6. Repair damaged wiring or replace switch

Related codes

P05C7P05C8P05C9

Error P05CA by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05CA code mean?

P05CA is an OBD-II diagnostic trouble code that indicates: Economy Mode Switch Circuit High

What causes a P05CA error code?

The most common causes of P05CA include: Short circuit of the signal wire of the switch to power (+12V or +5V); Insulation damage with a short to an adjacent high-voltage wire; Switch internal short to power (switch failure); Moisture entering the connector, creating a path between the wires.

How do I fix a P05CA diagnostic trouble code?

To fix P05CA: Read the codes and data of the frozen frame with a scanner, pay attention to the conditions for the appearance of the code. Find and inspect the Eco Mode switch, check the connector for moisture and damage. Disconnect the switch connector and measure the voltage on the signal wire - if there is voltage without the switch connected, look for a short to power. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05CA?

Do not drive — repair immediately

How much does it cost to fix P05CA?

The estimated repair cost for P05CA is $11–78. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat