B1367 — Ignition Tach Circuit Failure #

The code label may differ depending on the manufacturer.
Known label variations:

• Ignition Tach Circuit Malfunction (Ford)
• Tachometer Circuit Fault (Honda)
• Ignition Tach Signal Failure (GM/Chevrolet)

Summary of code B1367 #

The B1367 trouble code signals an issue with the vehicle’s Ignition Tach Circuit. This circuit is responsible for transmitting engine RPM (revolutions per minute) data—commonly referred to as the tachometer signal—to the vehicle’s control modules and dashboard. When the circuit fails, the engine control unit (ECU) or body control module (BCM) detects an abnormal or missing signal, triggering this code. The root of the problem can range from wiring faults to sensor failures, and may impact both performance and dashboard readings. While this code is categorized as a Body (B-series) code, its effects often overlap with engine and electrical systems. Prompt diagnosis is crucial to maintain vehicle reliability and prevent miscommunication between critical modules.

Common symptoms for code B1367 #

A B1367 code can produce a variety of symptoms, some subtle and others more pronounced. Drivers may notice issues with the dashboard tachometer, while technicians might observe irregularities in engine data reporting. Here are the most common signs:

• Non-functional or erratic tachometer (RPM gauge)
• Intermittent or steady check engine or warning lights
• Unusual idling or engine surging (in rare cases, if tach signal is used for idle control)
• Difficulty with remote start or anti-theft systems relying on RPM data
• Possible loss of cruise control function

Most probable causes for code B1367 #

The causes of a B1367 code usually relate to electrical issues within the ignition tach circuit, but can also involve connected modules or sensors. Here’s what most often triggers this code, ranked by likelihood:

1. Faulty wiring or poor electrical connections in the tach circuit (corrosion, broken wires, loose connectors)
2. Defective ignition tach sensor (or engine speed sensor, depending on vehicle design)
3. Faulty instrument cluster or dashboard gauge
4. Malfunctioning Body Control Module (BCM) or Engine Control Unit (ECU)
5. Aftermarket remote start or alarm system interference

Step-by-step diagnostic for code B1367 #

Diagnosing a B1367 code requires a systematic approach to locate and verify the fault. Here’s a practical process:

• Scan for additional codes: Check for related DTCs, which can help narrow down the root problem.
• Inspect wiring and connectors: Visually and physically inspect the ignition tach circuit wiring for corrosion, damage, or loose connectors—especially near the ignition system, ECU, and instrument cluster.
• Test the tach signal: Use a multimeter or oscilloscope to check for signal integrity and voltage at key points in the circuit.
• Check the ignition tach sensor: Test the sensor’s resistance and output as specified by the OEM (Original Equipment Manufacturer).
• Evaluate the instrument cluster: If possible, use a scan tool to perform a gauge sweep or self-test to confirm tachometer operation.
• Check for aftermarket add-ons: Look for non-OEM remote starts or alarms that may tap into the tach signal and cause interference.
• Consult OEM wiring diagrams: Reference the manufacturer’s documentation for correct pinouts and circuit paths.

Possible repairs for code B1367 #

Once the culprit is identified, the repairs should target the root cause. Here’s what technicians commonly do to resolve a B1367 Ignition Tach Circuit Failure:

• Repair or replace damaged wiring/connectors in the tach circuit
• Replace a faulty ignition tach sensor or engine speed sensor, as required
• Replace or repair the instrument cluster if the tachometer gauge is at fault
• Reprogram or replace the BCM/ECU if internal failure is confirmed
• Remove or properly integrate aftermarket devices interfering with the tach circuit

Is it safe to drive with code B1367? #

Limited. While most vehicles remain driveable with a B1367 code, it’s not advisable to ignore it. Tachometer failure can mask engine performance issues, and in rare cases, module miscommunication may impact safety features or remote start systems. Addressing the code promptly avoids potential cascading electrical problems and ensures you have accurate engine RPM data.

Vehicles most commonly affected by code B1367 #

The B1367 code is seen across several makes, especially those using tach signal-based systems for anti-theft and remote start. It’s been reported more frequently on:

• Ford (especially F-Series, Focus, and Expedition)
• Honda (Accord, Civic)
• Chevrolet (Silverado, Malibu)
• GMC (Sierra, Yukon)
• Some Mazda models (Mazda6, Tribute)

However, the code can appear on various vehicles using similar tach circuit designs.

Common mistakes & best practices with code B1367 #

Misdiagnosis and overlooked details are frequent with this code. Avoiding these pitfalls increases repair success and reduces comebacks:

• Replacing the tach sensor without checking wiring first
• Ignoring aftermarket device interference
• Not referencing OEM wiring diagrams
• Overlooking subtle corrosion or pin fitment issues in connectors
• Assuming the instrument cluster is always the cause

Best practices: Always verify power, ground, and signal integrity before replacing parts, and check for recent modifications or installations that may affect the circuit.

Quick FAQ for code B1367 #

What does “Ignition Tach Circuit” mean?
This refers to the wiring and components that transmit the engine’s RPM signal from the ignition system or engine speed sensor to the vehicle’s control modules and dashboard tachometer.

Can I clear the B1367 code myself?
You can clear the code with a scan tool, but it will likely return unless the root cause is repaired. Always address the underlying issue to prevent recurrence.