Which motorcycles does code 07-01 apply to?

It is documented here for the Honda CBR600RR (2003-2022). Other Honda models may use the same display code with a different meaning, so confirm against your model.

Can I still ride with code 07-01?

It depends on the fault. Code 07-01 relates to the ECT (coolant temperature) sensor. If the bike runs poorly or a safety-related system is affected, avoid riding until it is checked. The FI light stays on until the fault is fixed and the codes are cleared.

07-01 Confirmed

ECT sensor circuit low voltage

The coolant temperature sensor read too low, as if its circuit is shorted, and stayed that way long enough to count as a real fault.

Manufacturer: Honda
Platform: PGM-FI (Keihin, Renesas M32R)
Models: CBR600RR
Years: 2003-2022
Subsystem: ECT (coolant temperature) sensor
FI-light blink: 7 short
Hex: 0x0701

Saw 07-01 as 7 short on the FI light? Decode a blink pattern →

All major 07 codes How blink codes work

Confirmed. Confirmed: how the ECU detects this was traced in the firmware and matches the standard Honda meaning of the code.

What it means

The coolant temperature sensor tells the ECU how warm the engine is, which sets cold-start enrichment and fan behaviour. The ECU checks its signal against a normal range. A signal stuck below the low limit (a shorted sensor or wire) sets this code, and the ECU falls back to a default temperature while it is active.

Conditions

Detection conditions

The ECU reads the coolant temperature sensor against a normal range.

Sets the fault when

The signal stays below the low limit long enough to rule out brief noise.

Clears the fault when

Fix the underlying problem, then clear the stored codes with a diagnostic tool or the manufacturer’s reset procedure. If the fault is still present, the code returns the next time the ECU detects it.

Parts involved

Engine coolant temperature (ECT) sensor
Its signal and ground wiring

Symptoms & likely causes

Possible symptoms

FI (check-engine) light on
Poor cold running or fast-idle behaviour, since a default temperature is used

Likely causes

Coolant sensor signal shorted to ground
Failed (shorted) coolant sensor
Corroded connector

Diagnostic guidance

A low reading usually means the signal is shorted low or the sensor has failed short. Cold-running symptoms are expected while this code is active.

How the ECU decides

A simplified view of the logic behind this code: a short C snippet with a plain-English summary. It shows the real decision the ECU makes without the low-level detail.

The ECU checks each sensor against a normal high and a normal low value. A brief spike is ignored; only a reading that stays out of range long enough counts as a real fault. Too low sets the "-01" (low) code, too high sets the "-02" (high) code.

C How an out-of-range sensor sets a code

1// A sensor reading outside its normal band, held long enough to be real.
2if (reading < low_limit || reading > high_limit) {
3    bad_count++;               // ignore brief electrical noise
4    if (bad_count >= limit)
5        set_fault();           // low -> "-01", high -> "-02"
6} else {
7    bad_count = 0;             // back in range: no fault
8}

Reverse-engineered interpretation · CBR600RR ECU reverse-engineering analysis

When the ECU confirms a fault, it saves the code and turns on the FI (check-engine) light. For a serious fault it also runs the engine on safe default values (limp-home) so you can still ride, with the light on.

C How a confirmed fault is stored

1// Once a fault is confirmed, remember it and warn the rider.
2if (fault_confirmed) {
3    store_code(code);      // kept until the codes are cleared
4    fi_light = ON;
5    if (fault_is_serious)
6        limp_home = ON;    // safe defaults so you can ride home
7}

Reverse-engineered interpretation · CBR600RR ECU reverse-engineering analysis

Related codes

Questions about code 07-01

What does Honda code 07-01 mean?: The coolant temperature sensor read too low, as if its circuit is shorted, and stayed that way long enough to count as a real fault.
Which motorcycles does code 07-01 apply to?: It is documented here for the Honda CBR600RR (2003-2022). Other Honda models may use the same display code with a different meaning, so confirm against your model.
Can I still ride with code 07-01?: It depends on the fault. Code 07-01 relates to the ECT (coolant temperature) sensor. If the bike runs poorly or a safety-related system is affected, avoid riding until it is checked. The FI light stays on until the fault is fixed and the codes are cleared.
What should I check first for code 07-01?: A low reading usually means the signal is shorted low or the sensor has failed short. Cold-running symptoms are expected while this code is active.

Sources

Every technical claim on this page traces to the research below. Source labels are sanitized; no local research paths are exposed.

firmware

2005-2006 Honda CBR600RR ECU firmware

Factory PGM-FI firmware for the 2005-2006 CBR600RR. Primary source of truth.
analysis

Firmware fault-code table extraction

Reads the list of codes the ECU can store directly out of each firmware.
reference

HondaECU project (open-source Honda ECU tool)

Community reference mapping Honda PGM-FI codes to their meanings.
analysis

CBR600RR ECU reverse-engineering analysis

Independent analysis of how the ECU detects, stores, and reports faults.
reference

Honda diagnostic data-tables reference (CBR600RR)

Dealer diagnostic data list and sensor readings for the CBR600RR.

Content version 1.0.0 · last reviewed 2026-07-14

Decode a blink pattern All major 07 codes Full DTC index