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| # | Post Title | Result Info | Date | User | Forum |
| Ford/Mazda/Lincoln/Mercury PCM Repair | 4 Relevance | 8 months ago | Ernest | Other (automotive part) | |
| ⚠ WARNING — PLEASE READ! ⚠ Replace ALL coil packs & spark plugs with OEM parts BEFORE reinstalling the PCM. Faulty coil packs are a 2-way component — they can burn out the soldered-in ignition coil drivers inside the PCM. Repeat damage caused by faulty coil packs is NOT covered by warranty. Replacing all coil packs and spark plugs prior to PCM reinstallation is strongly recommended. Important: Use this guide if you reinstalled your repaired Ford/Mazda/Lincoln/Mercury PCM and the problem is still happening. Do not open/disassemble the PCM or probe the connector pins with tools that can spread terminals. Step 1: Replace All Coil Packs & Spark Plugs (Do This First) The #1 reason these PCMs fail is burned ignition coil driver circuits caused by faulty coil packs. Because coil packs are a 2-way component, a bad coil can destroy the PCM driver that controls it. Before doing anything else: Replace ALL ignition coil packs with OEM (Motorcraft) coils — not aftermarket. Replace ALL spark plugs with OEM (Motorcraft) plugs at the same time. Do NOT reuse the old coil packs, even if only one cylinder was misfiring. A weak coil on another cylinder can take out the new PCM. If cost is a concern, at minimum replace the coil pack(s) on the cylinder(s) that were misfiring, but be aware that reusing old coils on other cylinders carries risk. Step 2: Cylinder Misfire Still Present? — Perform a Coil Swap Test If you still have a misfire code (P0301–P0312) after installing the repaired PCM with new coil packs and plugs, perform a coil swap test to determine whether the problem is the coil, the plug, or something else: Note the misfiring cylinder. For example, P0304 = cylinder 4. Swap the coil pack from the misfiring cylinder with a coil from a known-good cylinder (e.g., swap cylinder 4 coil with cylinder 2 coil). Clear the codes and drive the vehicle until the check engine light returns. If the misfire code moves to the other cylinder (now P0302), the coil pack is the problem. Replace that coil. If the misfire stays on the original cylinder (still P0304), the coil is not the issue. Repeat the same swap test with the spark plug. If the misfire still stays on the original cylinder after swapping both the coil and plug, the issue is likely mechanical (low compression, damaged valve, injector issue) or a wiring/connector problem on that cylinder. Have the vehicle inspected by a qualified technician. Step 3: Confirm the Correct PCM Was Installed Verify the part number / service number on the PCM matches your vehicle requirements. If a different PCM was installed, confirm it has the correct calibration for your engine, transmission, and emissions configuration. Step 4: Battery Voltage & Charging System Check Low voltage can cause no-start, stalling, false sensor codes, and communication issues. Check battery terminals for tight/clean connections and confirm the battery holds proper charge (12.4V+ at rest, 13.5–14.5V running). Step 5: Check PCM Power Fuses, Main Relay & Grounds Inspect PCM/ECM/ENG fuses and the main relay that feeds the PCM. If a fuse blows again, stop — have the circuit inspected for a short before replacing more fuses. Confirm engine-to-chassis and battery-to-chassis grounds are clean and tight. A weak ground can mimic a bad PCM even if the PCM tests good. Step 6: Inspect PCM Connectors & Wiring Unplug and replug all PCM connectors until fully seated and locked. Look for bent pins, pushed-back terminals, corrosion/green buildup, moisture, or damaged wiring near the PCM. Inspect the PCM cavity/footwell area for water intrusion or dampness — moisture corrodes terminals and creates intermittent issues. Step 7: If You Have No Communication with the PCM Most “no communication” issues are NOT the PCM itself. Work through these checks: Confirm PCM has power and ground first — check the fuses, main relay, and ground connections (Step 5). Check the OBD-II diagnostic connector (DLC). Verify pin 16 has battery voltage and pin 4/5 have good grounds. A dead DLC can look like a dead PCM. Inspect the CAN bus wiring. DLC pins 6 and 14 are the CAN High and CAN Low lines to the PCM. Check for damaged, chafed, or shorted wiring, especially near the firewall and battery tray. Try a different scan tool. Some generic OBD-II readers lose communication with Ford PCMs. Use a Ford-compatible tool (such as FORScan or a professional-grade scanner) to rule out tool incompatibility. If all of the above checks out and you still have no communication, contact us for further assistance. Step 8: If Symptoms Are Unchanged After All Checks Have a qualified shop perform voltage-drop testing on PCM power and ground circuits under load. Intermittent problems are most often wiring, grounds, relay sockets, or corrosion — not the PCM itself. Contact our tech support team with your diagnostic findings and we will assist you further. Reminder: Warranty does not cover repeat PCM damage caused by faulty coil packs. Always install new OEM coil packs and spark plugs before reinstalling the repaired PCM. | |||||
| 2013 Mazda MX-5 TCM | 4 Relevance | 2 years ago | Scott Eagle | TCM Transmission Control Module | |
| 2013 mazda MX-5 TCM oem part number lfac189e1a. Can it be repaired? Attachment : 2013 mazda MX-5 TCM.png | |||||
| Mazda 2014 not shifting in low gear | 4 Relevance | 2 years ago | Cris Kramer | TCM Transmission Control Module | |
| mazda 2014 not shifting in low gear whats the problem | |||||
| 2006 Mazda 5 code P0758 with AT light on | 4 Relevance | 2 years ago | Nelson | TCM Transmission Control Module | |
| I just sent mine in for the mazda 5. Got code P0758 with AT and Engine light on. Car would not get pass gear 3 and when about to come to a stop the engine would make a big jult and clunk sound. Praying this is the fix with the TCM? | |||||
| 2010 Mazda 3 hatchback TCM | 4 Relevance | 2 years ago | JULIO G | TCM Transmission Control Module | |
| Message: Hi i want to repaire and program my mazda 3 2010 hatchback. I m in perth westren Australia. How can i ship this part , repaire and payment. Could you plz tell me what is the procedure. I have tried through your website but in customer detail coloum there are only two state us and canada . Could you plz tell me how to ship to you and repair it and ship back to me plz Attachment : mazda 3 2010 hatchback..png | |||||
| RE: 2013 MAZDA 5 TCM | 4 Relevance | 2 years ago | Serge - UpFix Team | TCM Transmission Control Module | |
| We do repair those TCM's! Please follow the link below to place your repair order. | |||||
| RE: Mazda TCM Troubleshooting | 4 Relevance | 2 years ago | Carl Matthias | TCM Transmission Control Module | |
| Please look at the backside of the TCM connector on this 2010 mazda 3. There is no wire present in pin #9. Attachment : 2024-09-20 15_44_58-Mazda TCM Troubleshooting – TCM Transmission Control Module – UpFix Forum and 5 .png Attachment : 2010 mazda 3 TCM connector rear view.JPEG | |||||
| RE: 2004 mazda 5 -- TCM? | 4 Relevance | 2 years ago | Serge - UpFix Team | TCM Transmission Control Module | |
| Thank you for contacting us. We specialize in repairing faulty electronic components. If your mechanic has informed you that you have a faulty unit, you can send it to us for a rebuild. If you are unsure whether your unit is faulty, we can perform a bench test for a nominal fee of $39.99. Should we determine that the unit is indeed faulty, we will charge you our standard repair price. Unfortunately, we are unable to pinpoint the exact issue remotely. If you wish to create an order click on the link provided below | |||||
| 2004 mazda 5 -- TCM? | 4 Relevance | 2 years ago | Michael Durkin | TCM Transmission Control Module | |
| I looked in the TCM listing for a mazda 5 and oldest was 2007 .... I'm wondering if a 2004 is not possible .... Symptom was only first 3 gears, then hard shift ... After sitting for 6 months seemed better but back to hard shift and only 3 gears after less than a week ... Fluid changed and was told fluids that came out looked fine ... | |||||
| RE: 2007 Mazda 3 TCM | 4 Relevance | 3 years ago | Serge - UpFix Team | TCM Transmission Control Module | |
| You can click the link below to view detailed instructions on how to remove the TCM. These instructions are for a 2007 mazda 3, however, its the same for your 2008 vehicle. | |||||
| 2007 Mazda 3 TCM | 4 Relevance | 3 years ago | Riadh A | TCM Transmission Control Module | |
| 2007 mazda 3 I am getting ready to pull off the TCM and get it sent over to you guys but I had a few questions: 1) What gear should my vehicle be in when I remove the tcm? 2) Do I need to disconnect the negative on my battery before pulling it off? 3) Does my e-brake need to be on or off? I was thinking of putting the car in Neutral before removing the TCM just in case I need to move/roll it for any reason. Would this be okay to do? Or does it need to be in a specific gear? | |||||
| 2011 Mazda 3 TCM Faulty | 4 Relevance | 3 years ago | GLIDZWELL | TCM Transmission Control Module | |
| 2011 mazda 3 I was wondering if you help with this problem. I purchased TCM on ebay and suspecting it is faulty. The part number: LF8M 18 9E1G is exact as my old one. After about 20min of driving starts to malfunction on and off (with AT light on and off, traction, and gear selector) and it goes back to normal for a while. Could this be faulty TCM? Attachment : 2011 mazda 3 TCM.webp Attachment : 2011 mazda 3 TCM 1.webp | |||||
| 2008 Mazda 3 TCM needed | 4 Relevance | 3 years ago | RUSTY KIRKLAND | TCM Transmission Control Module | |
| I did not see this part for my particular car and was wondering if there was a TCM part that would be able to fit a 2008 mazda 3 2.3 L?? Attachment : 2008 mazda 3 TCM x.jpg Attachment : 2008 mazda 3 TCM z.jpg | |||||