P2749 — Intermediate Shaft Speed Sensor C Circuit

OBD2 code P2749 flags a problem with the sensor and actuator circuits (intermediate shaft speed sensor c circuit). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, open or shorted wiring in the circuit, control module driver fault.

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm P2749 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the intermediate shaft speed sensor c circuit for damage, corrosion, chafing or poor contact.
  4. Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
  5. Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2749 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2749 (parts and labor, USD, independent shop rates): Control module repair: $300–$1,000; Replace the faulty sensor or actuator: $150–$500; Repair wiring or connectors: $80–$250. Overall, fixing P2749 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What does OBD2 code P2749 mean?

OBD2 code P2749 flags a problem with the sensor and actuator circuits (intermediate shaft speed sensor c circuit). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, open or shorted wiring in the circuit, control module driver fault.

How much does it cost to fix P2749?

Control module repair — $300–$1,000; Replace the faulty sensor or actuator — $150–$500; Repair wiring or connectors — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What are the symptoms of P2749?

Drivers most often notice: increased fuel consumption in some cases, the affected system operates intermittently or not at all, possible limp mode depending on the affected component, Check Engine Light on.

Is it safe to drive with P2749?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

Will P2749 clear itself?

Sometimes P2749 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does P2749 mean?

The engine control module sets P2749 when it detects a fault in the sensor and actuator circuits. In practical terms: intermediate shaft speed sensor c circuit. The code belongs to the powertrain (engine/transmission) group of OBD2 codes.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P2749 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

Common symptoms of P2749

  • increased fuel consumption in some cases
  • the affected system operates intermittently or not at all
  • possible limp mode depending on the affected component
  • Check Engine Light on

What causes P2749?

  • poor ground connection
  • control module driver fault
  • corroded, loose or damaged connector
  • faulty sensor or actuator of the affected circuit
  • blown fuse feeding the circuit
  • open or shorted wiring in the circuit

How to diagnose P2749

  1. Connect an OBD2 scanner, confirm P2749 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Visually inspect the wiring harness and connectors related to the intermediate shaft speed sensor c circuit for damage, corrosion, chafing or poor contact.
  4. Measure reference voltage, ground and signal continuity at the component connector.
  5. Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
  6. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2749 does not return.

How to fix P2749

Start with the cheapest and most common causes before replacing expensive parts:

  • Control module repair — $300–$1,000
  • Replace the faulty sensor or actuator — $150–$500
  • Repair wiring or connectors — $80–$250

How much does it cost to fix P2749?

Repair cost depends on which component actually failed. Typical scenarios for P2749 (parts and labor, USD, independent shop rates):

  • Control module repair: $300–$1,000
  • Replace the faulty sensor or actuator: $150–$500
  • Repair wiring or connectors: $80–$250

Overall, fixing P2749 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P2749?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

Related OBD2 codes