P07CA

Code

Generic P — Powertrain

Intermediate Shaft Speed Sensor C Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 22 EN: 29 RU: 24

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Causes

Short to battery or ignition-switched power on the sensor signal wire
Open, corroded, or damaged sensor connector or pins
Failed intermediate shaft speed sensor (Hall-effect or VR type)
Damaged, chafed, or pinched wiring harness
Poor ground or supply reference to the sensor circuit
Internal PCM/ECM fault (pull-up resistor or input driver damaged)

Symptoms

Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
Transmission shifting abnormalities or limp mode (if sensor used by TCM)
Erratic or missing intermediate shaft speed readings in live data
Cruise control disabled or not functioning
Possible driveability issues if sensor data is used by engine control

What to check

Read and record all stored and pending codes and freeze-frame data with a scan tool.
Monitor live data for Intermediate Shaft Speed Sensor C (raw voltage, frequency, or reported speed).
Clear the code and attempt to reproduce; note operating conditions when code returns.
Visually inspect sensor connector for corrosion, bent pins, damage, or contamination.
Wiggle test wiring harness while observing live data to find intermittent faults.
Backprobe the sensor connector and measure signal voltage with key ON (engine off) and while cranking/running as appropriate.

Signal parameters

Sensor type: commonly Hall-effect (digital square wave) or variable reluctor (AC sine). Verify vehicle service information.
Hall-effect expected signal: 0–5 V square wave, ~50% duty at steady rotation; idle-to-high frequency proportional to shaft speed.
VR expected signal: low-voltage AC (tens to hundreds of millivolts to a few volts peak) with frequency proportional to speed.
Reference supply: typically 5 V (some designs use switched 12 V) — confirm with service data.
Typical sensor resistance: varies by design (commonly hundreds to a few thousand ohms for Hall sensors); check OEM spec.
Circuit-high condition: signal pinned near reference or battery voltage (e.g., ~5 V or ~12 V) or higher than ECM allowed threshold.

Diagnostic algorithm

Verify code and conditions: Use a scan tool to record freeze-frame and live data for Intermediate Shaft Speed Sensor C. Note engine speed, vehicle speed, gear, temperature.
Reproduce and observe: Clear the code, then start engine and monitor the sensor signal while attempting to reproduce the fault. Note whether the signal is steady high, sporadic, or changes with cranking/engine speed.
Visual inspection: With ignition off, inspect the sensor and connector for damage, corrosion, bent pins, water intrusion, or loose terminals.
Backprobe and measure: With key ON (engine OFF) and while cranking/running as appropriate, backprobe the signal wire. If the signal is at or near the reference voltage (5 V or 12 V) with sensor connected or disconnected, suspect short to power or ECU internal pull-up.
Isolate sensor: Disconnect the sensor harness and measure the voltage at the harness connector. If the harness still reads high, check for a short to power in the wiring or a PCM output tied high. If it drops to open-circuit voltage, the sensor itself may be shorted internally.
Resistance and ground checks: With the sensor disconnected, measure sensor resistance to specification and check continuity from signal pin to PCM pin. Verify sensor ground integrity and continuity to chassis/ECM ground.
Wiggle test and repair: While monitoring live data, wiggle and manipulate the wiring harness between sensor and PCM to find intermittent opens/shorts. Repair any damaged wiring, terminals, or connectors (replace terminals or wiring as needed).
Supply/reference check: Verify the reference supply voltage to the sensor (5 V or 12 V) is within spec and stable. Repair voltage supply or ground problems if out of spec.
Replace sensor if tests indicate internal failure (resistance out of spec, no change when referenced). After replacement, clear codes and road test to confirm resolution.
If wiring and sensor check good: suspect PCM/ECM input driver fault. Confirm by re-checking continuity and signal behavior; if necessary, consult manufacturer technical service information before replacing the PCM.
Safety: Use proper backprobing techniques and take care to avoid shorting terminals. Disconnect battery only when instructed by repair procedure.