Chassis, generic

C0750 Left Front Tire Pressure Sensor

Check engine lightUsually off
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

None of the public code lists carries C0750. GM, however, uses it in its tire pressure monitoring for the left front wheel transmitter, and the Saab 9-5 (2010-2011) and 9-4X service pages define the subcodes: 03 for a weak sensor battery, 29 for a sensor that sends too few telegrams, 39 for an internal sensor defect. The check runs above 40 km/h, when the roll switch in each wheel unit should wake the transmitter; if it stays silent or its data are invalid, the body control module sets the code and the TPMS lamp blinks for a minute, then stays lit. GM bulletin PIC5650M lists C0750 among the effects of radio interference from add-on devices. C0755, C0760 and C0765 cover the other wheels. No evidence ties the code to a cruise control brake switch.

Likely causes

Built-in battery of the wheel sensor exhausted (subcode 03)
Sensor damaged during tire service, after a flat or replaced by a valve without sensor
Radio interference from aftermarket devices or metallised window tint (GM PIC5650M)
Remote receiver or its antenna unplugged or faulty

Symptoms

  • TPMS lamp flashes about one minute after start, then stays on
  • Dashes instead of a pressure value for the left front tire
  • Service tire monitor message in the driver display

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€40–250
Time0.3–1.5 h

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

Parts involved

tpms sensor flrke receiverbody control module

Related codes

C0950C0083C0077

References: saabwisonline.com, saabwisonline.com, static.nhtsa.gov.