P07C8

Code

Generic P — Powertrain

Intermediate Shaft Speed Sensor B Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 23 EN: 31 RU: 26

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Page language: EN

Causes

Open or damaged wiring in the sensor B circuit
Short to battery (12V) on the sensor B signal or reference wire
Corroded, loose, or damaged sensor connector pins
Faulty intermediate shaft speed sensor (Sensor B)
Poor or missing ground at the sensor or control module
Faulty transmission control module/ECM or damaged input pin

Symptoms

Check Engine Light (MIL) illuminated
Transmission may use default shift strategy or enter limp/torque-limited mode
Erratic shifting, delayed or harsh shifts
Loss of speed-dependent functions (lockup torque converter, AWD engagement, cruise control, ABS/traction-related behavior)
Possible incorrect speed readings or related warning lights

What to check

Read and record freeze-frame and related transmission/engine codes with a scan tool and note conditions when code set
Visually inspect intermediate shaft speed sensor connector and wiring for damage, corrosion, pin push-out, or contamination
Check connector mating and continuity of wiring harness to the control module (no chaffing through to chassis)
Back-probe sensor connector with ignition ON (engine off) to check reference voltage and ground
Perform wiggle test on harness and connector while monitoring signal to reproduce fault
Compare reading/signal of sensor B to sensor A (if available) to confirm discrepancy

Signal parameters

Typical hall-effect sensor: reference 5 V (approx. 5 V ±0.5 V) and signal pulsed between ~0–5 V; frequency proportional to shaft speed
Typical variable-reluctance (VR) sensor: AC sine/coil output; amplitude and frequency increase with shaft speed (may be 0.1–2.0 V AC or higher depending on speed)
Typical DC resistance for hall sensors may be manufacturer-specific — consult service manual before relying on resistance values
Oscilloscope waveform: clean square wave for hall sensors or clean sinusoidal waveform for VR sensors; noise or stuck-high DC indicates fault
Always confirm exact values and test procedures in the vehicle’s service manual

Diagnostic algorithm

Connect an advanced scan tool and confirm P07C8 is stored; note freeze-frame data and whether related transmission or speed-sensor codes are present
Visually inspect the intermediate shaft speed sensor B connector, wiring, and tone ring for contamination, damage, or loose mounting; repair any obvious problems
With ignition ON (engine OFF), back-probe the sensor connector: verify reference voltage (typically ~5 V) and a good ground; if reference or ground missing, trace wiring to control module and repair
Check sensor signal at connector with multimeter or oscilloscope while cranking or rotating the shaft: hall sensor should toggle between ~0–5 V; VR sensor should produce AC voltage proportional to speed. If signal is stuck high (near reference voltage), suspect short-to-battery or internal sensor failure
If signal is abnormal, disconnect the sensor and measure resistance between sensor terminals (if hall-type, check manufacturer spec). For VR sensors, check coil resistance and AC output while turning shaft
Perform continuity and short checks: verify no short to battery (12V) on the signal wire and no short to ground; check for continuity between the sensor connector and the PCM input pin
If wiring and connectors check good but signal still wrong, replace the intermediate shaft speed sensor B and retest
If a new sensor does not restore proper signal and wiring is verified, consider PCM/input pin fault and consult manufacturer guidance before replacing control module
Clear codes and road test to confirm repair; re-scan for returned codes and verify proper operation of related systems