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Jerry, Master Mechanic
Category: Mazda
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Experience:  ASE Master certified, 30 years experience. Auto troubleshooting, electrical , ABS, SRS, EFI system
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05 Mazda Tribute: engine light came..gas pedal..coil..all spark plugs

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We have an '05 Mazda Tribute. The engine light came on, car idles rough, slight hesitation with the gas pedal on occasion. The dealer says its a coil problem and wants to replace the coil and all spark plugs for $900, but thinks we should replace all coils for a total of $2000. Could it be anything else?

Hello and welcome to Just, Super mechanic here. About your vehicle.

There have benn some issues with the coil on plug ignition systems and the factory does recommend replacing all 0f the coils and plugs.

However, the $2000 price may include the PCM, which some of them would need also. Here are the prices along with the servic bulletin.

Parts Information
Part OEM Part Price
Ignition Coil
Ignition Coil AJ0918100 $104.17
Labor Skill
Ignition Coil
Right Side
One B 0.0 1.6
Two or More B 0.0 1.9
Left Side
One B 0.0 0.5
Two or More B 0.0 0.6
All, Both Sides B 0.0 2.3

Engine Controls - MIL ON/Multiple Coil On Plug DTC's

TSB: 01-027/05

P0351, P0352, P0353, P0354, P0355, P0356 (3.0L ENGINE)



2005 Tribute 3.0L Engine Only





Some 2005 Tributes with a 3.0L engine, may exhibit a malfunction indicator lamp (MIL) ON with two or more diagnostic trouble codes (DTCs) for coil-on-plug (COP) primary circuit faults (P0351, P0352, P0353, P0354, P0355, P0356). This may be due to the spark plugs causing RF interference with the PCM, resulting in damage to the PCM and COPs.



It may be necessary to replace the PCM, COPs and install new level spark plugs.

Customers having this concern should have their vehicle repaired using the following repair procedure.





1. Verify concern

2. Perform Key On Engine Running (KOER) test.

- If there is only one (1) coil circuit primary DTC (P035x), proceed to PROCEDURE"A".

- If there are two (2) or more coil circuit primary DTCs (P035x-P035x), proceed to PROCEDURE"B".





1. Remove any spark plug and inspect for a 2-digit date code.

a. If a date code is not present, replace all six (6) spark plugs.

b. Continue with normal troubleshooting for the DTC.




1. Remove any spark plug and inspect for a 2-digit date code.

- If a date code is not present, replace all six (6) spark plugs.

2. Replace all six (6) COPs.

3. Replace PCM according to the Workshop Manual (section 01-40 POWERTRAIN CONTROL MODULE (PCM), Removal and Installation).

4. Verify repair.


Parts Information
Part OEM Part Price
Engine Control Module
From 1/1/03 AJY818881F $503.89
Labor Skill
Engine Control Module
Replace A 0.0 0.3
Does Not Include: Diagnosis Times.

Customer: replied 5 years ago.
They did not mention PCM. What is that? Should I ask if checked the date on the spark plugs? All I was told is that they hooked it up to the computer to find out what was wrong and then made recommendations. Someone could have looked at the spark plugs but if they did they didn't mention it.
They know I'm sure, to replace the plugs and coils. The PCM may not need to be replaced, that depends on what they find in the diagnosis. That is the Engine, (powertrain) control module.
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