P2752

Code

Generic P — Powertrain

Intermediate Shaft Speed Sensor C Circuit Intermittent

Brand: Generic

Type: P — Powertrain

Views: UK: 11 EN: 28 RU: 24

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Page language: EN

Causes

Damaged, corroded, or loose connector at the intermediate shaft speed sensor C
Broken, chafed, or pinched wiring in the sensor harness causing intermittent contact
Poor or intermittent ground or 5V reference to the sensor
Failing speed sensor (Hall-effect or variable reluctance) with intermittent output
Contamination (metal debris, fluid) or mechanical damage to the sensor/sensor area
Intermittent short to battery or ground due to wiring movement

Symptoms

Check Engine Light or Transmission MIL illuminated (intermittent)
Transmission shift irregularities: harsh, delayed, or erratic shifts
Transmission may enter limp/derate mode intermittently
Increased transmission slippage or torque converter lock-up faults
Intermittent speed-related behavior while driving (surging or inconsistent)
Possible stored or pending codes related to other speed sensors or gear ratio

What to check

Read freeze-frame and live data; note when the intermittent event occurs (idle, acceleration, load, temperature)
Check for multiple occurrence counts or related transmission codes
Visually inspect sensor connector for corrosion, bent pins, moisture or contamination
Wiggle test the harness and connector while monitoring live data or checking for code set
Measure reference voltage (usually ~5V) and ground at the sensor connector with key ON
Backprobe the signal wire and capture signal with an oscilloscope or high-speed graphing scanner while cranking/driving

Signal parameters

Sensor type: may be Hall-effect (digital) or variable reluctance (VR); confirm application-specific type before testing
Hall-effect: reference voltage ~4.5–5.0 V; signal is a square/pulsed waveform swinging near 0.2 V (low) to ~4.5 V (high) with frequency proportional to shaft speed
VR sensor: AC sine waveform with amplitude increasing with speed; low RPM may be small millivolt AC, higher RPM several volts AC peak-to-peak
Typical no-rotation idle frequency: low Hz (near 0 Hz at rest); frequency rises proportionally with intermediate shaft RPM — consult vehicle-specific specs for exact Hz/RPM
Typical static resistance (where applicable): VR sensors often 600–1500 ohms; Hall sensors usually show high resistance or open circuit between signal and reference (refer to service manual)

Diagnostic algorithm

Retrieve all stored and pending DTCs and freeze frame data. Note operating conditions when code set.
Clear codes and attempt to reproduce. If intermittent, try driving under different loads, speeds, and temperatures.
Visually inspect the intermediate shaft speed sensor C connector and wiring for damage, corrosion, or fluid intrusion.
With the connector mated, backprobe the signal, reference, and ground wires. Verify stable reference voltage (~5 V for Hall) with key ON and good ground.
Wiggle the harness and connector while monitoring live data or an oscilloscope to detect intermittent interruptions that reproduce the fault.
Use an oscilloscope to capture the sensor signal while cranking and driving. Look for dropouts, noise, irregular amplitude, or abnormal waveform shape.
If signal is missing or intermittent at the connector, unplug sensor and inspect pins. Measure continuity from sensor plug to TCM connector; repair any opens or shorts.
If wiring and connector are good but signal is erratic or out of spec, replace the intermediate shaft speed sensor C and retest.
If replacement sensor does not restore correct signal, trace and repair wiring to PCM and inspect PCM connector pins. Consider module input circuit testing or replacement only after wiring and sensor are verified good.
After repairs, clear codes and perform a road test to confirm the intermittent condition is resolved and no related codes return.

Likely causes

Intermittent or corroded connector / pin terminal at the sensor
Wiring harness damage (chafe/wire break) producing intermittent contact
Sensor internal failure (intermittent output)
Poor ground or unstable 5V reference from the control module

Fault status

⚠️ Status

Intermittent fault detected on Intermediate Shaft Speed Sensor C circuit. Code P2752 indicates sporadic signal dropouts, noise, or intermittent open/short between the sensor and the transmission control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours