DTC Status Bit Definitions

Refer to the following status bit descriptions:

Bit 7

• 0 - The ECU is not requesting warning indicator to be active
• 1 - The ECU is requesting warning indicator to be active

Bit 6

• 0 - The DTC test completed this monitoring cycle
• 1 - The DTC test has not completed this monitoring cycle

Bit 5

• 0 - The DTC test has not failed since last code clear
• 1 - The DTC test failed at least once since last code clear

Bit 4

• 0 - The DTC test completed since the last code clear
• 1 - The DTC test has not completed since the last code clear

Bit 3

• 0 - The DTC is not confirmed at the time of the request
• 1 - The DTC is confirmed at the time of the request

Bit 2

• 0 - The DTC test completed and was not failed on the current or previous monitoring cycle
• 1 - The DTC test failed on the current or previous monitoring cycle

Bit 1

• 0 - The DTC test has not failed on the current monitoring cycle
• 1 - The DTC test failed on the current monitoring cycle

Bit 0

• 0 - The DTC is not failed at the time of request
• 1 - The DTC is failed at the time of request

For DTCs that illuminate the MIL, a confirmed DTC means the PCM has stored a DTC and has illuminated the MIL. If the fault has corrected itself, the MIL may no longer be illuminated but the DTC still shows a confirmed status for 40 warm up cycles at which time the DTC is erased.

For DTCs that do not illuminate the MIL, a confirmed DTC means the PCM has stored a DTC. If the fault has corrected itself, the DTC still shows a confirmed status for 40 warm up cycles at which time the DTC is erased.

To determine if a test has completed and passed, such as after a repair, information can be combined from 2 bits as follows:

If bit 6 is 0 (the DTC test completed this monitoring cycle), and bit 1 is 0 (the DTC test has not failed on the current monitoring cycle), then the DTC has been evaluated at least once this drive cycle and was a pass.

If bit 6 is 0 (the DTC test completed this monitoring cycle) and bit 0 is 0 (the DTC test is not failed at the time of request), then the most recent test result for that DTC was a pass.

The status byte bits can be decoded as a 2 digit hexadecimal number, and displayed as the last 2 digits of the DTC, for example for DTC P0110:1C-AF, AF represents the status byte info.

Status Byte
A equals 1010				F equals 1111
Bit 7 equals 1	Bit 6 equals 0	Bit 5 equals 1	Bit 4 equals 0	Bit 3 equals 1	Bit 2 equals 1	Bit 1 equals 1	Bit 0 equals 1