Powertrain, generic (extended)

P281C Pressure Control Solenoid H Control Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P281C is meant for a circuit of solenoid H that is electrically intact but does not behave plausibly, for example when the measured current fails to follow the commanded value. No manufacturer documents this code publicly; CARB 13 CCR 1968.2 only demands functional monitoring of output circuits. GM's 2023 Corvette dual-clutch software does run exactly such a test on its H valve, comparing the current estimated from duty cycle and battery voltage with the target, but files a deviation of over 70 % or 200 mA under the high-side code P281E. On the G side, Nissan-built CVTs use the matching code P2813 mainly for a hydraulic engagement fault. If P281C appears, check coil resistance against specification and look for high contact resistance.

Likely causes

Coil resistance of valve H outside specification
Corroded or loose contacts raising circuit resistance
Unstable supply voltage to the solenoid driver

Symptoms

  • MIL or transmission warning on
  • Shift quality varies from drive to drive
  • Possible substitute program

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–2,500
Time1–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

pressure control solenoid hwiring harness

Related codes

P281BP281DP281EP2819P2813

References: law.cornell.edu, gsi.ext.gm.com.