OBD Guide
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P0600

Serial Communication Link

P0600 is an OBD-II diagnostic trouble code meaning: Serial Communication Link. Common causes: faulty can bus or k-line (damage to wiring), faulty ecu (problem in the communication interface). Estimated repair cost: $56–444.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–444 (est.)

Symptoms

  • Check Engine Light Is On
  • Inability to connect the diagnostic scanner or loss of communication
  • Multiple error codes from different systems at the same time
  • Unstable operation of several systems (ABS, ESP, transmission)
  • Intermittent malfunctions of the dashboard

Causes

  • Faulty CAN bus or K-Line (damage to wiring)
  • Faulty ECU (problem in the communication interface)
  • Short circuit or break in data lines (CAN High / CAN Low)
  • The data bus load exceeds the permissible limit (several blocks occupy the bus)
  • Malfunction of the OBD-II connector or wiring to it

How to Fix

  1. Check the ECU supply voltage - unstable power causes communication errors
  2. Inspect the OBD-II connector for bent, oxidized or broken pins
  3. Try a different diagnostic scanner or cable
  4. Measure the voltage on the CAN H and CAN L buses (standard at rest: CAN H ~2.5V, CAN L ~2.5V)
  5. Check the resistance between CAN H and CAN L (normal: ~60 Ohm with units connected)
  6. Diagnose all control units for bus conflicts

Related codes

P0601P0602P0603P0604U0001U0100

Error P0600 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0600 code mean?

P0600 is an OBD-II diagnostic trouble code that indicates: Serial Communication Link

What causes a P0600 error code?

The most common causes of P0600 include: Faulty CAN bus or K-Line (damage to wiring); Faulty ECU (problem in the communication interface); Short circuit or break in data lines (CAN High / CAN Low); The data bus load exceeds the permissible limit (several blocks occupy the bus).

How do I fix a P0600 diagnostic trouble code?

To fix P0600: Check the ECU supply voltage - unstable power causes communication errors. Inspect the OBD-II connector for bent, oxidized or broken pins. Try a different diagnostic scanner or cable. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0600?

Do not drive — repair immediately

How much does it cost to fix P0600?

The estimated repair cost for P0600 is $56–444. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat