B1367 — Ignition Tach Circuit Failure

B1367 — Ignition Tach Circuit Failure. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: worn spark plugs or wrong plug gap, failed ignition coil or coil pack, moisture or oil in the spark plug wells.

body electrical

Is it safe to drive?

Drive with caution Drive with caution and avoid load. Ignition faults cause misfires that quickly overheat and destroy the catalytic converter; if the Check Engine Light flashes, stop and fix it first.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm B1367 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
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 B0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the ignition system for damage, corrosion, chafing or poor contact.
Subsystem check Swap the coil to another cylinder and see if the fault code follows it.
Subsystem check Inspect spark plugs for wear, oil or carbon tracks and check plug gaps.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm B1367 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1367 (parts and labor, USD, independent shop rates): Replace an ignition coil: $150–$380; Repair coil wiring or connector: $80–$250; Replace spark plugs: $90–$250. Overall, fixing B1367 usually costs between $80 and $380. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

How do I diagnose B1367 myself?

Start with a scan: confirm B1367, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the ignition tach circuit, and verify the suspect component against live data before buying parts.

What does OBD2 code B1367 mean?

Will B1367 clear itself?

Sometimes B1367 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.

Is it safe to drive with B1367?

Drive with caution and avoid load. Ignition faults cause misfires that quickly overheat and destroy the catalytic converter; if the Check Engine Light flashes, stop and fix it first.

What is the most common cause of B1367?

The most common causes are: worn spark plugs or wrong plug gap, failed ignition coil or coil pack, moisture or oil in the spark plug wells.

When your vehicle's control unit detects a signal problem in the ignition tachometer circuit, it logs diagnostic trouble code B1367. This code belongs to the body electrical classification, which covers systems beyond the powertrain itself. The tach circuit's job is to feed accurate engine RPM data back to the computer and instrument cluster. When that signal goes missing, becomes erratic, or falls outside expected parameters, the module flags the fault.

The control module monitors ignition tach readings against factory-defined thresholds, typically across several consecutive drive cycles, before confirming a genuine failure and setting B1367. This multi-check approach prevents false alarms from transient electrical noise. Once the code is stored, the ECU also captures a freeze frame—a snapshot recording engine speed, load, coolant temperature, and vehicle speed at the moment the problem first appeared. That snapshot tells you exactly what conditions triggered the fault, which makes diagnosis much faster when you start troubleshooting.

Common Symptoms of B1367

Engine misfires, whether at idle or under acceleration
Noticeable increase in fuel consumption
Difficult engine starts, especially in wet or humid conditions
Check Engine Light illuminated on the dashboard
Reduced engine power with hesitation or jerking during acceleration

What Causes B1367?

Damaged or corroded wiring and connectors in the ignition control circuit — the most frequent culprit
Failed ignition coil or ignition coil pack
Faulty ignition control circuit within the ECM or PCM itself
Worn or incorrectly gapped spark plugs
Moisture or oil contamination in the spark plug tube wells

How to Diagnose B1367

Connect an OBD2 scanner, retrieve code B1367, and record all freeze frame data. This data reveals engine conditions when the failure occurred.
Check for related diagnostic trouble codes that may point to the underlying cause. Also search for technical service bulletins (TSB) specific to your make, model, and model year — many body electrical faults have published factory updates or software recalibrations.
Perform a detailed visual inspection of the wiring harness and connectors feeding the ignition system. Look for frayed insulation, broken wires, corrosion buildup, and loose or pushed-out terminals.
Test the ignition coil's primary and secondary resistance using a multimeter, or swap it with a known-good coil from another cylinder and observe whether the fault code migrates with the part.
Remove and inspect the spark plugs for worn electrodes, carbon deposits, oil fouling, or incorrect electrode gap.
Clear B1367 after your inspection, then drive the vehicle through a complete drive cycle that reproduces the freeze frame conditions. Verify that the code does not return.

Repair Options and Costs

Ignition coil replacement: $150–$380
Wiring harness or connector repair: $80–$250
Spark plug replacement: $90–$250

All prices reflect parts and labor at independent shop rates in USD. Always address the least expensive and most common causes before replacing major components.

Total Cost to Fix B1367

Depending on which part is actually at fault, total repair costs typically range from $80 to $380 for parts and labor combined. An accurate diagnosis before purchasing parts is the best way to avoid overspending. The ignition coil is the most common replacement, but wiring issues — which cost considerably less to repair — are responsible for a significant share of B1367 cases.

Can You Drive with B1367?

Drive with caution. Ignition-related faults cause misfires that allow raw fuel to enter the exhaust stream, which can overheat and destroy the catalytic converter over time. If the Check Engine Light is flashing rather than steady, stop driving immediately and address the problem before continuing — a flashing MIL indicates a severe misfire that poses an immediate risk to emission control equipment.