{"id":517530,"date":"2025-12-10T05:13:58","date_gmt":"2025-12-10T10:13:58","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-p0379-timing-reference-high-resolution-signal-b-no-pulses\/"},"modified":"2025-12-10T05:13:58","modified_gmt":"2025-12-10T10:13:58","slug":"dtc-p0379-timing-reference-high-resolution-signal-b-no-pulses","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-p0379-timing-reference-high-resolution-signal-b-no-pulses\/","title":{"rendered":"P0379 Code Symptoms, Causes, Diagnostic Steps & Repair Costs"},"content":{"rendered":"
\n
\n
P0379<\/div>\n

P0379 Code Symptoms, Causes, Diagnostic Steps & Repair Costs<\/h1>\n

\n<\/section>\n

\n

Quick Summary<\/h2>\n
    \n
  • P0379 means the engine control module (ECM) receives **no high\u2011resolution timing reference pulses on Signal B**. <\/li>\n
  • Typical driver cues are a flashing \u201ccheck\u2011engine\u201d light, rough idle, misfires, or stalling. <\/li>\n
  • Primary culprits are wiring\/connectors, the high\u2011resolution timing sensor, or the ECM\u2019s internal timing circuit. <\/li>\n
  • Diagnosis requires a scan tool, a continuity test, and, if needed, ECM re\u2011programming or replacement. <\/li>\n
  • Flagship One supplies VIN\u2011matched ECMs and handles the required programming for a plug\u2011and\u2011drive install. <\/li>\n<\/ul>\n<\/div>\n

    P0379 Code \u2013 Immediate Symptoms<\/h3>\n

    Drivers who encounter P0379 usually notice one or more of the following while the vehicle is running:<\/p>\n

      \n
    • Check\u2011engine light<\/strong> flashing or steady, often accompanied by a stored code. <\/li>\n
    • Rough idle<\/strong> that feels uneven or \u201ccoughs\u201d at low speeds. <\/li>\n
    • Intermittent misfires<\/strong> that may appear as a hesitation during acceleration. <\/li>\n
    • Stalling<\/strong> when coming to a stop or during low\u2011load cruising. <\/li>\n<\/ul>\n

      These signs appear because the ECM cannot determine precise crankshaft position from the missing high\u2011resolution signal, forcing it to rely on lower\u2011resolution data that is less accurate for ignition timing.<\/p>\n

      Why Timing\u2011Reference Problems Occur <\/h3>\n

      1. Faulty High\u2011Resolution Timing Sensor (Signal B) <\/h4>\n

      The sensor generates a high\u2011frequency pulse train that the ECM uses for exact crank angle measurement. Internal coil failure, contamination, or physical damage can stop pulse generation entirely, producing the \u201cno pulses\u201d condition.<\/p>\n

      2. Wiring or Connector Failure <\/h4>\n

      The signal travels through a dedicated shielded wire. Corrosion, broken conductors, or a loose connector can interrupt the pulse train. Even a single high\u2011resistance joint can attenuate the signal enough that the ECM registers zero pulses.<\/p>\n

      3. ECM Internal Circuit Failure <\/h4>\n

      The ECM\u2019s high\u2011resolution timing interface includes a comparator and timing capture circuit. Water intrusion, thermal stress, or solder\u2011joint cracks can render that circuit inoperative, preventing the module from recognizing any incoming pulses.<\/p>\n

      Diagnostic and Repair Procedures <\/h3>\n
        \n
      1. Read and Clear Codes<\/strong> \u2013 Use an OBD\u2011II scan tool capable of displaying live data. Verify that P0379 is present and note any related codes (e.g., P0016, P0017) that may indicate broader timing issues.\n<\/li>\n
      2. Inspect Wiring Harness<\/strong> \u2013 Visually examine the high\u2011resolution timing sensor wire from the sensor to the ECM. Look for frayed insulation, burnt spots, or connector corrosion. Perform a continuity test; resistance should be \u2264 2 \u03a9. Replace damaged sections or clean corroded pins.\n<\/li>\n
      3. Test Sensor Output<\/strong> \u2013 With the ignition on, connect a digital oscilloscope to the sensor\u2019s Signal B wire. A healthy sensor produces a clean, high\u2011frequency square wave (typically 8\u201310 kHz). Absence of a waveform confirms sensor failure.\n<\/li>\n
      4. Swap Sensor (if available)<\/strong> \u2013 Install a known\u2011good sensor of the same type. Re\u2011scan; if P0379 clears, the original sensor is defective.\n<\/li>\n
      5. ECM Communication Check<\/strong> \u2013 Verify that the ECM can communicate on the CAN bus and that other modules report normal operation. Use the scan tool\u2019s \u201cmodule information\u201d function to confirm the ECM\u2019s firmware version and any pending updates.\n<\/li>\n
      6. Re\u2011program the ECM<\/strong> \u2013 If wiring and sensor test correctly, reflash the ECM with the latest calibration. Many manufacturers release timing\u2011reference updates that address intermittent pulse\u2011loss issues.\n<\/li>\n
      7. ECM Replacement<\/strong> \u2013 Should re\u2011programming not resolve the code, the internal timing capture circuit is likely damaged. Replace the ECM with a VIN\u2011matched unit and have it programmed to the vehicle\u2019s specifications.\n<\/li>\n<\/ol>\n

        Typical costs<\/strong> <\/p>\n

          \n
        • Wiring repair or connector cleaning: $50\u2011$120<\/strong> (parts and labor). <\/li>\n
        • Sensor replacement: $150\u2011$300<\/strong> plus labor. <\/li>\n
        • ECM re\u2011programming: $100\u2011$200<\/strong> for tool time. <\/li>\n
        • ECM replacement (VIN\u2011matched unit): $600\u2011$900<\/strong> plus $150\u2011$250<\/strong> labor. <\/li>\n<\/ul>\n

          When Replacement Makes More Sense Than Repair <\/h3>\n

          If the ECM\u2019s internal high\u2011resolution timing circuit has failed, repairs are often temporary. Moisture intrusion or solder\u2011joint fatigue tends to recur, leading to repeated diagnostics and lost time. A replacement ECM eliminates the root cause and restores full timing precision.<\/p>\n

          Modern control modules are complex and integrated with security and immobilizer systems. That\u2019s why choosing a replacement isn\u2019t only about the hardware\u2014it’s about correct programming and compatibility. Flagship One<\/strong> specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution backed by warranty. Their units arrive pre\u2011programmed for the specific vehicle, ensuring seamless integration and eliminating dealer\u2011only re\u2011coding delays.<\/p>\n

          Preventive Maintenance <\/h3>\n
            \n
          • Keep wiring protected<\/strong> \u2013 Routinely inspect the timing\u2011sensor harness for signs of wear, especially after engine bay work. Use dielectric grease on connectors to resist corrosion. <\/li>\n
          • Replace the timing sensor on schedule<\/strong> \u2013 Manufacturers often recommend sensor replacement every 100,000 mi or when the engine shows signs of timing drift. <\/li>\n
          • Maintain a dry engine bay<\/strong> \u2013 Address coolant leaks, oil spills, or water ingress promptly; moisture is a common culprit for ECM internal failures. <\/li>\n
          • Use a quality scan tool for periodic checks<\/strong> \u2013 Running a quick live\u2011data scan during routine service can catch a weakening signal before it drops out completely.<\/li>\n<\/ul>\n
            \n

            Service Recommendation:<\/strong> Most issues related to this fault are diagnosed and corrected through inspection, wiring repair, and calibration rather than module replacement. For modules not typically replaced through aftermarket suppliers, diagnosis and repair should be performed by a certified automotive technician with access to factory service information and tooling.<\/p>\n<\/div>\n

            \n

            Frequently Asked Questions<\/h2>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

            No timing reference signal B pulses cause erratic timing in your vehicle\u2014misfires. Scan the PCM, check wiring, then reprogram or replace the module.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-517530","post","type-post","status-publish","format-standard","hentry","category-auto-news"],"acf":[],"yoast_head":"\nP0379 Code Symptoms, Causes, Diagnostic Steps & Repair Costs - Flagship One Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0379-timing-reference-high-resolution-signal-b-no-pulses\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0379 Code Symptoms, Causes, Diagnostic Steps & Repair Costs - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"No timing reference signal B pulses cause erratic timing in your vehicle\u2014misfires. 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