Powertrain, generic (extended)

P27B0 Pressure Control Solenoid K Data Incompatible

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P27B0 closes the data-incompatible series with letter K, and no public manufacturer document uses it. It would describe a tenth pressure control solenoid whose calibration record in the transmission controller is missing, mismatched or corrupt. For comparison, GM's 2020 table checks the records of valves A to H once per power-up and rates failures Type A; the ten-speed there needs only eight such valves. CARB 13 CCR 1968.2 is the legal basis for monitoring such output components. Practically, a workshop would treat K like its siblings: confirm the valve body ID, load the matching data and clear the code. A broken coil or wiring would produce circuit codes instead, not this data fault.

Likely causes

Valve K data never programmed into a new or used TCM

Valve body ID in the TCM differs from the fitted unit

Software update overwrote or damaged the data block

Symptoms

MIL on
Shift quality problems on gears using valve K

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€100–400

Time0.5–2 h

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

Parts involved

pressure control solenoid ktcm

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