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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Nov-27-2019, 08:39:05 PM   #1
Aeko
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Default TPMS issue and optimistic speedometer

I have two issues that have been bugging me for a bit with my M3: The TPMS light will not reset no matter what, and the speedometer is about 7% optimistic. I don't have any codes or diagnostics to go from at this point (nothing showing in INPA or on my Schwaben), only symptoms.

I've tried checking tire pressures, doing the TPMS reset while at speed, etc, but it always immediately comes back. Is this possibly a wheel speed sensor issue, and if so is there a definitive test I can do to check this?
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Old Wed, Nov-27-2019, 08:42:28 PM   #2
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Default Re: TPMS issue and optimistic speedometer

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Originally Posted by Aeko View Post
I have two issues that have been bugging me for a bit with my M3: The TPMS light will not reset no matter what, and the speedometer is about 7% optimistic. I don't have any codes or diagnostics to go from at this point (nothing showing in INPA or on my Schwaben), only symptoms.

I've tried checking tire pressures, doing the TPMS reset while at speed, etc, but it always immediately comes back. Is this possibly a wheel speed sensor issue, and if so is there a definitive test I can do to check this?
How can you do a "TPMS reset while at speed"?

Describe specifically how you are re-learning pressures - because that description sounds like that procedure is the more likely problem.
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Old Wed, Nov-27-2019, 08:49:26 PM   #3
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Default Re: TPMS issue and optimistic speedometer

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Originally Posted by lmtfi View Post
How can you do a "TPMS reset while at speed"?

Describe specifically how you are re-learning pressures - because that description sounds like that procedure is the more likely problem.
I've tried different things as described on the forum. What I'm doing is cruising at about 60, pressing and holding the DSC button for 5 seconds until the red TPMS light goes off, then after about a minute it beeps and comes back.
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Old Wed, Nov-27-2019, 09:04:16 PM   #4
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Default Re: TPMS issue and optimistic speedometer

What tires are you running, and when is the last time you had the car aligned?
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Old Wed, Nov-27-2019, 09:17:45 PM   #5
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Default Re: TPMS issue and optimistic speedometer

speedometer is a few % optimistic by design.

Procedure to reset TPMS is as follows:

1. Check Tire Pressure to make sure no variance from side to side.
2. Sit in car, with out touching the pedals.
3. Key in ignition, Turn key on to engine off position (second position).
4. Press and hold TPM until TPM lights go out completely on the dash.
5. Press and hold TPM again until yellow TPM light indicator comes lit on dash.
6. Start car and drive. Light will go off itself once it has calibrated tire pressure. (might go out at idle).
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Old Wed, Nov-27-2019, 09:19:17 PM   #6
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Default Re: TPMS issue and optimistic speedometer

Quote:
Originally Posted by ThunderMoose View Post
speedometer is a few % optimistic by design.

Procedure to reset TPMS is as follows:

1. Check Tire Pressure to make sure no variance from side to side.
2. Sit in car, with out touching the pedals.
3. Key in ignition, Turn key on to engine off position (second position).
4. Press and hold TPM until TPM lights go out completely on the dash.
5. Press and hold TPM again until yellow TPM light indicator comes lit on dash.
6. Start car and drive. Light will go off itself once it has calibrated tire pressure. (might go out at idle).
Can reset it with car on and at idle as well...
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Old Wed, Nov-27-2019, 09:20:26 PM   #7
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Default Re: TPMS issue and optimistic speedometer

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Originally Posted by Aeko View Post
I've tried different things as described on the forum. What I'm doing is cruising at about 60, pressing and holding the DSC button for 5 seconds until the red TPMS light goes off, then after about a minute it beeps and comes back.
You can't do "different things as described on the forum". That is why it doesn't work.

Follow the procedure posted by TMoose above. Follow it exactly.
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Old Wed, Nov-27-2019, 09:20:38 PM   #8
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Default Re: TPMS issue and optimistic speedometer

You have actual TPMS sensors in your E46 M3?

You should be resetting while not moving.
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Old Wed, Nov-27-2019, 09:26:12 PM   #9
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Default TPMS issue and optimistic speedometer

I relearn/reset mine when Iím driving or else it wonít work. Once Iím going straight I just hold the FTM (Flat Tire Monitor) button until it lights up in the speedo which is usually 5 seconds. Then I let go and just drive. Within half a block or less the light turns off and the DSC computer has calculated all wheel speeds to compare from if one tire becomes abnormal.

My car does not have any external sensors. I think all Canadian vehicles didnít have mandatory active TPMS until a certain year, just FTM. Even my dadís 2014 F10 535d just has FTM.
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Old Thu, Nov-28-2019, 02:49:22 PM   #10
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Default Re: TPMS issue and optimistic speedometer

My bet is on Moose's step 1- check tire pressures between left and right. Maybe also tire condition in case tires were rotated (assuming square setup or if staggered maybe alignment) and now left is different from right.

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Discussing TPMS issue and optimistic speedometer in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)